feat: add column sort, SQL formatter, table stats, insert dialog, saved queries & sessions monitor

- Column sort by header click in table view (ASC/DESC/none cycle, server-side)
- SQL formatter with Format button and Shift+Alt+F keybinding (sql-formatter)
- Table size and row count display in schema tree via pg_class
- Insert row dialog with column type hints and auto-skip for identity columns
- Saved queries (bookmarks) with CRUD backend, sidebar panel, and save dialog
- Active sessions monitor (pg_stat_activity) with auto-refresh, cancel & terminate

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/src/lib.rs

@@ -36,6 +36,7 @@ pub fn run() {
             commands::schema::get_table_constraints,
             commands::schema::get_table_indexes,
             commands::schema::get_completion_schema,
+            commands::schema::get_column_details,
             // data
             commands::data::get_table_data,
             commands::data::update_row,
@@ -55,10 +56,17 @@ pub fn run() {
             commands::management::get_table_privileges,
             commands::management::grant_revoke,
             commands::management::manage_role_membership,
+            commands::management::list_sessions,
+            commands::management::cancel_query,
+            commands::management::terminate_backend,
             // history
             commands::history::add_history_entry,
             commands::history::get_history,
             commands::history::clear_history,
+            // saved queries
+            commands::saved_queries::list_saved_queries,
+            commands::saved_queries::save_query,
+            commands::saved_queries::delete_saved_query,
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");