diff --git a/Makefile b/Makefile
index c4ba190..dd66a7e 100644
--- a/Makefile
+++ b/Makefile
@@ -98,12 +98,14 @@ export DESKTOP_ENTRY
 
 .PHONY: install
 install: build ## Build release and install to system (PREFIX=/usr/local)
-	install -Dm755 $(TARGET_DIR)/$(APP_NAME) $(DESTDIR)$(BINDIR)/$(APP_NAME)
+	@mkdir -p $(DESTDIR)$(BINDIR)
+	install -m755 $(TARGET_DIR)/$(APP_NAME) $(DESTDIR)$(BINDIR)/$(APP_NAME)
 	@mkdir -p $(DESTDIR)$(DATADIR)/applications
 	@echo "$$DESKTOP_ENTRY" > $(DESTDIR)$(DATADIR)/applications/$(APP_NAME).desktop
 	@for size in 32x32 128x128; do \
 		if [ -f src-tauri/icons/$$size.png ]; then \
-			install -Dm644 src-tauri/icons/$$size.png \
+			mkdir -p $(DESTDIR)$(DATADIR)/icons/hicolor/$$size/apps; \
+			install -m644 src-tauri/icons/$$size.png \
 				$(DESTDIR)$(DATADIR)/icons/hicolor/$$size/apps/$(APP_NAME).png; \
 		fi; \
 	done
diff --git a/eslint.config.js b/eslint.config.js
index 5e6b472..3041488 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -6,7 +6,7 @@ import tseslint from 'typescript-eslint'
 import { defineConfig, globalIgnores } from 'eslint/config'
 
 export default defineConfig([
-  globalIgnores(['dist']),
+  globalIgnores(['dist', 'src-tauri']),
   {
     files: ['**/*.{ts,tsx}'],
     extends: [
@@ -19,5 +19,11 @@ export default defineConfig([
       ecmaVersion: 2020,
       globals: globals.browser,
     },
+    rules: {
+      // TODO: fix these incrementally — pre-existing violations from react-hooks v7 upgrade
+      'react-hooks/set-state-in-effect': 'warn',
+      'react-hooks/refs': 'warn',
+      'react-refresh/only-export-components': ['warn', { allowConstantExport: true }],
+    },
   },
 ])
diff --git a/package-lock.json b/package-lock.json
index a420f16..f46c36a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,9 +15,9 @@
         "@tauri-apps/api": "^2.10.1",
         "@tauri-apps/plugin-dialog": "^2.6.0",
         "@tauri-apps/plugin-shell": "^2.3.5",
-        "@types/dagre": "^0.7.53",
+        "@types/dagre": "^0.7.54",
         "@uiw/react-codemirror": "^4.25.4",
-        "@xyflow/react": "^12.10.0",
+        "@xyflow/react": "^12.10.2",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "cmdk": "^1.1.1",
@@ -37,6 +37,8 @@
         "@eslint/js": "^9.39.1",
         "@tailwindcss/vite": "^4.1.18",
         "@tauri-apps/cli": "^2.10.0",
+        "@testing-library/jest-dom": "^6.9.1",
+        "@testing-library/react": "^16.3.2",
         "@types/node": "^24.10.1",
         "@types/react": "^19.2.7",
         "@types/react-dom": "^19.2.3",
@@ -45,14 +47,30 @@
         "eslint-plugin-react-hooks": "^7.0.1",
         "eslint-plugin-react-refresh": "^0.4.24",
         "globals": "^16.5.0",
+        "jsdom": "^28.1.0",
         "shadcn": "^3.8.4",
         "tailwindcss": "^4.1.18",
         "tw-animate-css": "^1.4.0",
         "typescript": "~5.9.3",
         "typescript-eslint": "^8.48.0",
-        "vite": "^7.3.1"
+        "vite": "^7.3.1",
+        "vitest": "^4.0.18"
       }
     },
+    "node_modules/@acemir/cssom": {
+      "version": "0.9.31",
+      "resolved": "https://registry.npmjs.org/@acemir/cssom/-/cssom-0.9.31.tgz",
+      "integrity": "sha512-ZnR3GSaH+/vJ0YlHau21FjfLYjMpYVIzTD8M8vIEQvIGxeOXyXdzCI140rrCY862p/C/BbzWsjc1dgnM9mkoTA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@adobe/css-tools": {
+      "version": "4.4.4",
+      "resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.4.4.tgz",
+      "integrity": "sha512-Elp+iwUx5rN5+Y8xLt5/GRoG20WGoDCQ/1Fb+1LiGtvwbDavuSk0jhD/eZdckHAuzcDzccnkv+rEjyWfRx18gg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@antfu/ni": {
       "version": "25.0.0",
       "resolved": "https://registry.npmjs.org/@antfu/ni/-/ni-25.0.0.tgz",
@@ -75,6 +93,64 @@
         "nup": "bin/nup.mjs"
       }
     },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-5.0.1.tgz",
+      "integrity": "sha512-2SZFvqMyvboVV1d15lMf7XiI3m7SDqXUuKaTymJYLN6dSGadqp+fVojqJlVoMlbZnlTmu3S0TLwLTJpvBMO1Aw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^3.1.1",
+        "@csstools/css-color-parser": "^4.0.2",
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0",
+        "lru-cache": "^11.2.6"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
+      "version": "11.2.6",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.6.tgz",
+      "integrity": "sha512-ESL2CrkS/2wTPfuend7Zhkzo2u0daGJ/A2VucJOgQ/C48S/zB8MMeMHSGKYpXhIjbPxfuezITkaBH1wqv00DDQ==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
+      "version": "6.8.1",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-6.8.1.tgz",
+      "integrity": "sha512-MvRz1nCqW0fsy8Qz4dnLIvhOlMzqDVBabZx6lH+YywFDdjXhMY37SmpV1XFX3JzG5GWHn63j6HX6QPr3lZXHvQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@asamuzakjp/nwsapi": "^2.3.9",
+        "bidi-js": "^1.0.3",
+        "css-tree": "^3.1.0",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.2.6"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector/node_modules/lru-cache": {
+      "version": "11.2.6",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.6.tgz",
+      "integrity": "sha512-ESL2CrkS/2wTPfuend7Zhkzo2u0daGJ/A2VucJOgQ/C48S/zB8MMeMHSGKYpXhIjbPxfuezITkaBH1wqv00DDQ==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/@asamuzakjp/nwsapi": {
+      "version": "2.3.9",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/nwsapi/-/nwsapi-2.3.9.tgz",
+      "integrity": "sha512-n8GuYSrI9bF7FFZ/SjhwevlHc8xaVlb/7HmHelnc/PZXBD2ZR49NnN9sMMuDdEGPeeRQ5d0hqlSlEpgCX3Wl0Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@babel/code-frame": {
       "version": "7.29.0",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.0.tgz",
@@ -106,7 +182,6 @@
       "integrity": "sha512-CGOfOJqWjg2qW/Mb6zNsDm+u5vFQ8DxXfbM09z69p5Z6+mE1ikP2jUXw+j42Pf1XTYED2Rni5f95npYeuwMDQA==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.29.0",
         "@babel/generator": "^7.29.0",
@@ -550,6 +625,19 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@bramus/specificity": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/@bramus/specificity/-/specificity-2.4.2.tgz",
+      "integrity": "sha512-ctxtJ/eA+t+6q2++vj5j7FYX3nRu311q1wfYH3xjlLOsczhlhxAg2FWNUXhpGvAw3BWo1xBcvOV6/YLc2r5FJw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "css-tree": "^3.0.0"
+      },
+      "bin": {
+        "specificity": "bin/cli.js"
+      }
+    },
     "node_modules/@codemirror/autocomplete": {
       "version": "6.20.0",
       "resolved": "https://registry.npmjs.org/@codemirror/autocomplete/-/autocomplete-6.20.0.tgz",
@@ -650,7 +738,6 @@
       "resolved": "https://registry.npmjs.org/@codemirror/view/-/view-6.39.13.tgz",
       "integrity": "sha512-QBO8ZsgJLCbI28KdY0/oDy5NQLqOQVZCozBknxc2/7L98V+TVYFHnfaCsnGh1U+alpd2LOkStVwYY7nW2R1xbw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@codemirror/state": "^6.5.0",
         "crelt": "^1.0.6",
@@ -658,6 +745,138 @@
         "w3c-keyname": "^2.2.4"
       }
     },
+    "node_modules/@csstools/color-helpers": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.0.2.tgz",
+      "integrity": "sha512-LMGQLS9EuADloEFkcTBR3BwV/CGHV7zyDxVRtVDTwdI2Ca4it0CCVTT9wCkxSgokjE5Ho41hEPgb8OEUwoXr6Q==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.1.1.tgz",
+      "integrity": "sha512-HJ26Z/vmsZQqs/o3a6bgKslXGFAungXGbinULZO3eMsOyNJHeBBZfup5FiZInOghgoM4Hwnmw+OgbJCNg1wwUQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-color-parser": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.0.2.tgz",
+      "integrity": "sha512-0GEfbBLmTFf0dJlpsNU7zwxRIH0/BGEMuXLTCvFYxuL1tNhqzTbtnFICyJLTNK4a+RechKP75e7w42ClXSnJQw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/color-helpers": "^6.0.2",
+        "@csstools/css-calc": "^3.1.1"
+      },
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-parser-algorithms": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-4.0.0.tgz",
+      "integrity": "sha512-+B87qS7fIG3L5h3qwJ/IFbjoVoOe/bpOdh9hAjXbvx0o8ImEmUsGXN0inFOnk2ChCFgqkkGFQ+TpM5rbhkKe4w==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-syntax-patches-for-csstree": {
+      "version": "1.0.28",
+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.0.28.tgz",
+      "integrity": "sha512-1NRf1CUBjnr3K7hu8BLxjQrKCxEe8FP/xmPTenAxCRZWVLbmGotkFvG9mfNpjA6k7Bw1bw4BilZq9cu19RA5pg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0"
+    },
+    "node_modules/@csstools/css-tokenizer": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.0.tgz",
+      "integrity": "sha512-QxULHAm7cNu72w97JUNCBFODFaXpbDg+dP8b/oWFAZ2MTRppA3U00Y2L1HqaS4J6yBqxwa/Y3nMBaxVKbB/NsA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
     "node_modules/@dotenvx/dotenvx": {
       "version": "1.52.0",
       "resolved": "https://registry.npmjs.org/@dotenvx/dotenvx/-/dotenvx-1.52.0.tgz",
@@ -1438,6 +1657,24 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
+    "node_modules/@exodus/bytes": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.14.1.tgz",
+      "integrity": "sha512-OhkBFWI6GcRMUroChZiopRiSp2iAMvEBK47NhJooDqz1RERO4QuZIZnjP63TXX8GAiLABkYmX+fuQsdJ1dd2QQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@noble/hashes": "^1.8.0 || ^2.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@noble/hashes": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@floating-ui/core": {
       "version": "1.7.4",
       "resolved": "https://registry.npmjs.org/@floating-ui/core/-/core-1.7.4.tgz",
@@ -1821,7 +2058,6 @@
       "integrity": "sha512-2I0gnIVPtfnMw9ee9h1dJG7tp81+8Ob3OJb3Mv37rx5L40/b0i7djjCVvGOVqc9AEIQyvyu1i6ypKdFw8R8gQw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": "^14.21.3 || >=16"
       },
@@ -3796,6 +4032,13 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@standard-schema/spec": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@standard-schema/spec/-/spec-1.1.0.tgz",
+      "integrity": "sha512-l2aFy5jALhniG5HgqrD6jXLi/rUWrKvqN/qJx6yoJsgKhblVd+iqqU4RCXavm/jPityDo5TCvKMnpjKnOriy0w==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@tailwindcss/node": {
       "version": "4.1.18",
       "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.1.18.tgz",
@@ -4399,6 +4642,82 @@
         "@tauri-apps/api": "^2.10.1"
       }
     },
+    "node_modules/@testing-library/dom": {
+      "version": "10.4.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.1.tgz",
+      "integrity": "sha512-o4PXJQidqJl82ckFaXUeoAW+XysPLauYI43Abki5hABd853iMhitooc6znOnczgbTYmEP6U6/y1ZyKAIsvMKGg==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/runtime": "^7.12.5",
+        "@types/aria-query": "^5.0.1",
+        "aria-query": "5.3.0",
+        "dom-accessibility-api": "^0.5.9",
+        "lz-string": "^1.5.0",
+        "picocolors": "1.1.1",
+        "pretty-format": "^27.0.2"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@testing-library/jest-dom": {
+      "version": "6.9.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/jest-dom/-/jest-dom-6.9.1.tgz",
+      "integrity": "sha512-zIcONa+hVtVSSep9UT3jZ5rizo2BsxgyDYU7WFD5eICBE7no3881HGeb/QkGfsJs6JTkY1aQhT7rIPC7e+0nnA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@adobe/css-tools": "^4.4.0",
+        "aria-query": "^5.0.0",
+        "css.escape": "^1.5.1",
+        "dom-accessibility-api": "^0.6.3",
+        "picocolors": "^1.1.1",
+        "redent": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=14",
+        "npm": ">=6",
+        "yarn": ">=1"
+      }
+    },
+    "node_modules/@testing-library/jest-dom/node_modules/dom-accessibility-api": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/dom-accessibility-api/-/dom-accessibility-api-0.6.3.tgz",
+      "integrity": "sha512-7ZgogeTnjuHbo+ct10G9Ffp0mif17idi0IyWNVA/wcwcm7NPOD/WEHVP3n7n3MhXqxoIYm8d6MuZohYWIZ4T3w==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@testing-library/react": {
+      "version": "16.3.2",
+      "resolved": "https://registry.npmjs.org/@testing-library/react/-/react-16.3.2.tgz",
+      "integrity": "sha512-XU5/SytQM+ykqMnAnvB2umaJNIOsLF3PVv//1Ew4CTcpz0/BRyy/af40qqrt7SjKpDdT1saBMc42CUok5gaw+g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.12.5"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@testing-library/dom": "^10.0.0",
+        "@types/react": "^18.0.0 || ^19.0.0",
+        "@types/react-dom": "^18.0.0 || ^19.0.0",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "@types/react-dom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@ts-morph/common": {
       "version": "0.27.0",
       "resolved": "https://registry.npmjs.org/@ts-morph/common/-/common-0.27.0.tgz",
@@ -4427,6 +4746,14 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/@types/aria-query": {
+      "version": "5.0.4",
+      "resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
+      "integrity": "sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw==",
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+      "license": "MIT",
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+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/tagged-tag": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/tagged-tag/-/tagged-tag-1.0.0.tgz",
@@ -9725,6 +10596,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/tinybench": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+      "integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/tinyexec": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.0.2.tgz",
@@ -9752,6 +10630,16 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
+    "node_modules/tinyrainbow": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.0.3.tgz",
+      "integrity": "sha512-PSkbLUoxOFRzJYjjxHJt9xro7D+iilgMX/C9lawzVuYiIdcihh9DXmVibBe8lmcFrRi/VzlPjBxbN7rH24q8/Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/tldts": {
       "version": "7.0.23",
       "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.0.23.tgz",
@@ -9808,6 +10696,19 @@
         "node": ">=16"
       }
     },
+    "node_modules/tr46": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-6.0.0.tgz",
+      "integrity": "sha512-bLVMLPtstlZ4iMQHpFHTR7GAGj2jxi8Dg0s2h2MafAE4uSWF98FC/3MomU51iQAMf8/qDUbKWf5GxuvvVcXEhw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/ts-api-utils": {
       "version": "2.4.0",
       "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.4.0.tgz",
@@ -9913,7 +10814,6 @@
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "dev": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -9946,6 +10846,16 @@
         "typescript": ">=4.8.4 <6.0.0"
       }
     },
+    "node_modules/undici": {
+      "version": "7.22.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-7.22.0.tgz",
+      "integrity": "sha512-RqslV2Us5BrllB+JeiZnK4peryVTndy9Dnqq62S3yYRRTj0tFQCwEniUy2167skdGOy3vqRzEvl1Dm4sV2ReDg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.18.1"
+      }
+    },
     "node_modules/undici-types": {
       "version": "7.16.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.16.0.tgz",
@@ -10122,7 +11032,6 @@
       "integrity": "sha512-w+N7Hifpc3gRjZ63vYBXA56dvvRlNWRczTdmCBBa+CotUzAPf5b7YMdMR/8CQoeYE5LX3W4wj6RYTgonm1b9DA==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "esbuild": "^0.27.0",
         "fdir": "^6.5.0",
@@ -10192,12 +11101,103 @@
         }
       }
     },
+    "node_modules/vitest": {
+      "version": "4.0.18",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.0.18.tgz",
+      "integrity": "sha512-hOQuK7h0FGKgBAas7v0mSAsnvrIgAvWmRFjmzpJ7SwFHH3g1k2u37JtYwOwmEKhK6ZO3v9ggDBBm0La1LCK4uQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.0.18",
+        "@vitest/mocker": "4.0.18",
+        "@vitest/pretty-format": "4.0.18",
+        "@vitest/runner": "4.0.18",
+        "@vitest/snapshot": "4.0.18",
+        "@vitest/spy": "4.0.18",
+        "@vitest/utils": "4.0.18",
+        "es-module-lexer": "^1.7.0",
+        "expect-type": "^1.2.2",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^3.10.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.0.3",
+        "vite": "^6.0.0 || ^7.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.0.18",
+        "@vitest/browser-preview": "4.0.18",
+        "@vitest/browser-webdriverio": "4.0.18",
+        "@vitest/ui": "4.0.18",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/w3c-keyname": {
       "version": "2.2.8",
       "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
       "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==",
       "license": "MIT"
     },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/web-streams-polyfill": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
@@ -10208,6 +11208,41 @@
         "node": ">= 8"
       }
     },
+    "node_modules/webidl-conversions": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
+      "integrity": "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-5.0.0.tgz",
+      "integrity": "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "16.0.1",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-16.0.1.tgz",
+      "integrity": "sha512-1to4zXBxmXHV3IiSSEInrreIlu02vUOvrhxJJH5vcxYTBDAx51cqZiKdyTxlecdKNSjj8EcxGBxNf6Vg+945gw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.11.0",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -10224,6 +11259,23 @@
         "node": ">= 8"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
@@ -10318,6 +11370,23 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
@@ -10454,7 +11523,6 @@
       "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
diff --git a/package.json b/package.json
index 43ce77f..3e2eb0a 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,8 @@
     "build": "tsc -b && vite build",
     "lint": "eslint .",
     "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "tauri": "tauri"
   },
   "dependencies": {
@@ -18,9 +20,9 @@
     "@tauri-apps/api": "^2.10.1",
     "@tauri-apps/plugin-dialog": "^2.6.0",
     "@tauri-apps/plugin-shell": "^2.3.5",
-    "@types/dagre": "^0.7.53",
+    "@types/dagre": "^0.7.54",
     "@uiw/react-codemirror": "^4.25.4",
-    "@xyflow/react": "^12.10.0",
+    "@xyflow/react": "^12.10.2",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",
@@ -40,6 +42,8 @@
     "@eslint/js": "^9.39.1",
     "@tailwindcss/vite": "^4.1.18",
     "@tauri-apps/cli": "^2.10.0",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
     "@types/node": "^24.10.1",
     "@types/react": "^19.2.7",
     "@types/react-dom": "^19.2.3",
@@ -48,11 +52,13 @@
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",
     "globals": "^16.5.0",
+    "jsdom": "^28.1.0",
     "shadcn": "^3.8.4",
     "tailwindcss": "^4.1.18",
     "tw-animate-css": "^1.4.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.48.0",
-    "vite": "^7.3.1"
+    "vite": "^7.3.1",
+    "vitest": "^4.0.18"
   }
 }
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index 1b6d48c..4b52816 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -35,3 +35,6 @@ rmcp = { version = "0.15", features = ["server", "macros", "transport-streamable
 axum = "0.8"
 schemars = "1"
 tokio-util = "0.7"
+
+[dev-dependencies]
+tokio = { version = "1", features = ["rt", "macros"] }
diff --git a/src-tauri/build.rs b/src-tauri/build.rs
index 795b9b7..d860e1e 100644
--- a/src-tauri/build.rs
+++ b/src-tauri/build.rs
@@ -1,3 +1,3 @@
 fn main() {
-  tauri_build::build()
+    tauri_build::build()
 }
diff --git a/src/stores/__tests__/app-store.test.ts b/src/stores/__tests__/app-store.test.ts
new file mode 100644
index 0000000..34c5ad3
--- /dev/null
+++ b/src/stores/__tests__/app-store.test.ts
@@ -0,0 +1,217 @@
+import { describe, it, expect, beforeEach } from "vitest";
+import { useAppStore } from "../app-store";
+import type { Tab } from "@/types";
+
+function resetStore() {
+  useAppStore.setState({
+    connections: [],
+    activeConnectionId: null,
+    currentDatabase: null,
+    connectedIds: new Set(),
+    readOnlyMap: {},
+    dbFlavors: {},
+    tabs: [],
+    activeTabId: null,
+    sidebarWidth: 260,
+    pgVersion: null,
+  });
+}
+
+const makeTab = (id: string, type: Tab["type"] = "query"): Tab => ({
+  id,
+  type,
+  title: `Tab ${id}`,
+  connectionId: "conn-1",
+});
+
+describe("AppStore", () => {
+  beforeEach(() => {
+    resetStore();
+  });
+
+  // ── Connections ────────────────────────────────────────────
+
+  describe("connections", () => {
+    it("should set active connection id", () => {
+      useAppStore.getState().setActiveConnectionId("conn-1");
+      expect(useAppStore.getState().activeConnectionId).toBe("conn-1");
+    });
+
+    it("should clear active connection id", () => {
+      useAppStore.getState().setActiveConnectionId("conn-1");
+      useAppStore.getState().setActiveConnectionId(null);
+      expect(useAppStore.getState().activeConnectionId).toBeNull();
+    });
+
+    it("should add connected id and default to read-only", () => {
+      useAppStore.getState().addConnectedId("conn-1");
+      const state = useAppStore.getState();
+      expect(state.connectedIds.has("conn-1")).toBe(true);
+      expect(state.readOnlyMap["conn-1"]).toBe(true);
+    });
+
+    it("should remove connected id and clean up maps", () => {
+      const s = useAppStore.getState();
+      s.addConnectedId("conn-1");
+      s.setDbFlavor("conn-1", "postgresql");
+      s.setReadOnly("conn-1", false);
+
+      useAppStore.getState().removeConnectedId("conn-1");
+
+      const state = useAppStore.getState();
+      expect(state.connectedIds.has("conn-1")).toBe(false);
+      expect(state.readOnlyMap["conn-1"]).toBeUndefined();
+      expect(state.dbFlavors["conn-1"]).toBeUndefined();
+    });
+
+    it("should not affect other connections on remove", () => {
+      const s = useAppStore.getState();
+      s.addConnectedId("conn-1");
+      s.addConnectedId("conn-2");
+      s.setDbFlavor("conn-1", "postgresql");
+      s.setDbFlavor("conn-2", "greenplum");
+
+      useAppStore.getState().removeConnectedId("conn-1");
+
+      const state = useAppStore.getState();
+      expect(state.connectedIds.has("conn-2")).toBe(true);
+      expect(state.readOnlyMap["conn-2"]).toBe(true);
+      expect(state.dbFlavors["conn-2"]).toBe("greenplum");
+    });
+
+    it("should toggle read-only mode", () => {
+      useAppStore.getState().addConnectedId("conn-1");
+      expect(useAppStore.getState().readOnlyMap["conn-1"]).toBe(true);
+
+      useAppStore.getState().setReadOnly("conn-1", false);
+      expect(useAppStore.getState().readOnlyMap["conn-1"]).toBe(false);
+
+      useAppStore.getState().setReadOnly("conn-1", true);
+      expect(useAppStore.getState().readOnlyMap["conn-1"]).toBe(true);
+    });
+
+    it("addConnectedId forces read-only true on reconnect", () => {
+      useAppStore.getState().addConnectedId("conn-1");
+      useAppStore.getState().setReadOnly("conn-1", false);
+      // Reconnect resets to read-only
+      useAppStore.getState().addConnectedId("conn-1");
+      expect(useAppStore.getState().readOnlyMap["conn-1"]).toBe(true);
+    });
+  });
+
+  // ── Tabs ──────────────────────────────────────────────────
+
+  describe("tabs", () => {
+    it("should add tab and set it as active", () => {
+      useAppStore.getState().addTab(makeTab("tab-1"));
+
+      const state = useAppStore.getState();
+      expect(state.tabs).toHaveLength(1);
+      expect(state.tabs[0].id).toBe("tab-1");
+      expect(state.activeTabId).toBe("tab-1");
+    });
+
+    it("should activate the most recently added tab", () => {
+      useAppStore.getState().addTab(makeTab("tab-1"));
+      useAppStore.getState().addTab(makeTab("tab-2"));
+      expect(useAppStore.getState().activeTabId).toBe("tab-2");
+    });
+
+    it("should close tab and activate last remaining", () => {
+      useAppStore.getState().addTab(makeTab("tab-1"));
+      useAppStore.getState().addTab(makeTab("tab-2"));
+      useAppStore.getState().addTab(makeTab("tab-3"));
+      useAppStore.getState().setActiveTabId("tab-2");
+
+      useAppStore.getState().closeTab("tab-2");
+
+      const state = useAppStore.getState();
+      expect(state.tabs).toHaveLength(2);
+      // When closing the active tab, last remaining tab becomes active
+      expect(state.activeTabId).toBe("tab-3");
+    });
+
+    it("should set activeTabId to null when closing the only tab", () => {
+      useAppStore.getState().addTab(makeTab("tab-1"));
+      useAppStore.getState().closeTab("tab-1");
+
+      expect(useAppStore.getState().tabs).toHaveLength(0);
+      expect(useAppStore.getState().activeTabId).toBeNull();
+    });
+
+    it("should preserve activeTabId when closing a non-active tab", () => {
+      useAppStore.getState().addTab(makeTab("tab-1"));
+      useAppStore.getState().addTab(makeTab("tab-2"));
+      useAppStore.getState().setActiveTabId("tab-1");
+
+      useAppStore.getState().closeTab("tab-2");
+
+      expect(useAppStore.getState().activeTabId).toBe("tab-1");
+    });
+
+    it("should update tab fields without affecting others", () => {
+      useAppStore.getState().addTab(makeTab("tab-1"));
+      useAppStore.getState().addTab(makeTab("tab-2"));
+
+      useAppStore.getState().updateTab("tab-1", { title: "Updated" });
+
+      expect(useAppStore.getState().tabs[0].title).toBe("Updated");
+      expect(useAppStore.getState().tabs[1].title).toBe("Tab tab-2");
+    });
+
+    it("should handle closing non-existent tab gracefully", () => {
+      useAppStore.getState().addTab(makeTab("tab-1"));
+      useAppStore.getState().closeTab("non-existent");
+
+      expect(useAppStore.getState().tabs).toHaveLength(1);
+      expect(useAppStore.getState().activeTabId).toBe("tab-1");
+    });
+
+    it("should handle different tab types", () => {
+      useAppStore.getState().addTab(makeTab("t1", "query"));
+      useAppStore.getState().addTab(makeTab("t2", "table"));
+      useAppStore.getState().addTab(makeTab("t3", "erd"));
+
+      expect(useAppStore.getState().tabs.map((t) => t.type)).toEqual([
+        "query",
+        "table",
+        "erd",
+      ]);
+    });
+  });
+
+  // ── Database state ────────────────────────────────────────
+
+  describe("database state", () => {
+    it("should set and clear current database", () => {
+      useAppStore.getState().setCurrentDatabase("mydb");
+      expect(useAppStore.getState().currentDatabase).toBe("mydb");
+
+      useAppStore.getState().setCurrentDatabase(null);
+      expect(useAppStore.getState().currentDatabase).toBeNull();
+    });
+
+    it("should set pg version", () => {
+      useAppStore.getState().setPgVersion("16.2");
+      expect(useAppStore.getState().pgVersion).toBe("16.2");
+    });
+
+    it("should set db flavor", () => {
+      useAppStore.getState().setDbFlavor("conn-1", "greenplum");
+      expect(useAppStore.getState().dbFlavors["conn-1"]).toBe("greenplum");
+    });
+  });
+
+  // ── Sidebar ───────────────────────────────────────────────
+
+  describe("sidebar", () => {
+    it("should set sidebar width", () => {
+      useAppStore.getState().setSidebarWidth(400);
+      expect(useAppStore.getState().sidebarWidth).toBe(400);
+    });
+
+    it("should have default sidebar width of 260", () => {
+      expect(useAppStore.getState().sidebarWidth).toBe(260);
+    });
+  });
+});
diff --git a/src/test/setup.ts b/src/test/setup.ts
new file mode 100644
index 0000000..f149f27
--- /dev/null
+++ b/src/test/setup.ts
@@ -0,0 +1 @@
+import "@testing-library/jest-dom/vitest";
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..a4c2343
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,15 @@
+import { defineConfig } from "vitest/config";
+import path from "path";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "jsdom",
+    setupFiles: ["./src/test/setup.ts"],
+  },
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./src"),
+    },
+  },
+});