Connections default to read-only. SQL editor wraps queries in a
read-only transaction so PostgreSQL rejects mutations. Data mutation
commands (update_row, insert_row, delete_rows) are blocked at the
Rust layer. Toolbar toggle with confirmation dialog lets users
switch to read-write. Badges shown in workspace, table viewer, and
status bar.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add SchemaTree with database/schema/category hierarchy, Sidebar with
search, Toolbar, TabBar, StatusBar, and full app layout with
resizable panels.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
