DB viewer + query editor enhancements (home-screen-ux-query-editor) (#4)

* feat: add query_history table migration (v5) (Task 1)

* feat: add isDestructiveQuery utility (Task 2)

* feat: add tabType discriminator and openQueryTab to dbViewerStore (Task 3)

* feat: add execute_query command with pagination and query history (Task 4)

* feat: add typed wrappers for executeQuery, getQueryHistory, clearQueryHistory (Task 5)

* fix: global search bypasses folder scope when filters active (Task 6)

* feat: add TagFilterDropdown with checkboxes and empty state (Task 7)

* feat: add DbTypeFilterDropdown with checkboxes and clear all (Task 8)

* feat: wire TagFilterDropdown/DbTypeFilterDropdown into ActionRow, add inline tag creation (Task 9)

* feat: add Name input to GeneralTab for connection editing (Task 10)

* feat: add QueryEditor Monaco wrapper with SQL mode and Cmd+Enter (Task 11)

* feat: add DestructiveQueryDialog with SQL preview and confirmation (Task 12)

* feat: integrate query tabs, Monaco editor, destructive guard into DbViewerScreen (Task 13)

* fix: harden moveConnection against race conditions on rapid drags (Task 14)

* docs: update AGENTS.md implementation status for Home Screen UX + Query Editor (Task 15)

* feat: switch tag filter to OR semantics, add environment filter (F-T16)

* feat: add activeEnvironment filter state to uiStore and useFilteredConnections (F-T17)

* feat: add environment filter select to Filters dropdown (F-T18)

* feat: filter folder cards by tag match or contained connections (F-T19)

* fix: keep grid header width to content, border last column

* fix: hide select-all checkbox and empty-state when no table open

* fix: filter folder cards by any active filter, show global search results (F-T20)

* feat: show 'Showing Search Results' breadcrumb with clear button (F-T21)

* docs: update README + AGENTS.md for Query Editor, filters, and planned AI integration (BYOK)

* feat: refresh indicator with spinning icon and pulse, defer auto-refresh on tab switch

* feat: smart default schema selection, refresh schemas on database switch

* fix: auto-refresh waits for in-flight refresh to complete before next tick

* style: shrink db viewer sidebar nav icons from 20px to 16px

* style: shrink db viewer sidebar nav buttons to 32px (8px padding)

* style: make Tables panel title xs, regular weight, muted

* style: bump Tables panel title back to sm, keep regular weight and muted

* feat: export schema diagram as PNG/JPEG/SVG (entire schema or viewport)

* chore: lockfile for html-to-image

* fix: raise schema visualizer toolbar above legend so export menu isn't hidden

* feat: schema export via save dialog, transparent background option, save notification

* fix: render nothing in tab bar when no tabs are open

* style: reduce tab bar height from 40px to 36px

* style: reduce tab bar height to 32px

* style: revert tab bar height to 36px

* feat: split tab bar with fixed +Query and Changes actions on the right

* style: blue play-icon Query button in tab bar

* refactor: remove sidebar New Query button (now in tab bar)

* style: conditional bottom padding in sidebar toolbar when nothing is below

* feat: distinguish table and query tabs with icons

* style: tab icons follow active/inactive state, muted colors

* feat: query tab toolbar (run/format/dialect badge) + bare transparent editor

* style: blue rounded Run Query button in query toolbar

* feat: smart platform-aware shortcut tooltip on Run Query (⌘+⏎ / Ctrl+Enter)

* style: show only the shortcut in the Run Query tooltip

* fix: Cmd+Enter keybinding stale closure; add run pulse to query toolbar; bundle monaco locally (offline)

* feat: show placeholder text in empty query editor

* feat: SQL autocomplete — keywords + table names from active schema

* feat: per-table column autocomplete on 'table.' + docs update

* feat: query-variant result toolbar — export/refresh/columns left, smart-unit execution time right

* fix: populate execution_time_ms on query results so the toolbar can show time taken

* fix: re-measure monaco fonts after async font load to stop cursor drift

* feat: resizable + collapsible query results panel

* refactor: move results caret onto the resize handle (centered), bottom caret when collapsed

* style: thin drag strip with caret on its own centered pill

* refactor: remove Queue button from table toolbar (Changes lives in tab bar)

* style: changes button becomes bordered rounded icon with count badge

* docs: mark tab-bar Changes queue button in AGENTS.md and README

src/lib/commands.test.ts

@@ -4,6 +4,7 @@ vi.mock("@tauri-apps/api/core", () => ({
   invoke: vi.fn().mockResolvedValue({ tables: [], relationships: [] }),
 }));
 
+import { invoke } from "@tauri-apps/api/core";
 import {
   testConnection,
   dbConnect,
@@ -15,6 +16,9 @@ import {
   executeChange,
   refreshConnection,
   getSchemaGraph,
+  executeQuery,
+  getQueryHistory,
+  clearQueryHistory,
 } from "./commands";
 import type { SchemaGraph } from "./types";
 
@@ -67,4 +71,35 @@ describe("commands", () => {
       expect(result).toBeInstanceOf(Promise);
     });
   });
+});
+
+describe("query commands", () => {
+  it("executeQuery calls invoke with correct args", async () => {
+    const mockResult = { columns: [], rows: [], total_rows: 0, page: 1, page_size: 50 };
+    vi.mocked(invoke).mockResolvedValueOnce(mockResult);
+
+    const result = await executeQuery("conn-1", "SELECT 1", 1, 50);
+
+    expect(invoke).toHaveBeenCalledWith("execute_query", {
+      connectionId: "conn-1",
+      query: "SELECT 1",
+      page: 1,
+      pageSize: 50,
+    });
+    expect(result).toEqual(mockResult);
+  });
+
+  it("getQueryHistory calls invoke", async () => {
+    const mockHistory = [{ id: "h1", connection_id: "c1", query_text: "SELECT 1", status: "success", executed_at: "2025-01-01" }];
+    vi.mocked(invoke).mockResolvedValueOnce(mockHistory);
+    const result = await getQueryHistory("conn-1", 10, 0);
+    expect(invoke).toHaveBeenCalledWith("get_query_history", { connectionId: "conn-1", limit: 10, offset: 0 });
+    expect(result).toEqual(mockHistory);
+  });
+
+  it("clearQueryHistory calls invoke", async () => {
+    vi.mocked(invoke).mockResolvedValueOnce(undefined);
+    await clearQueryHistory("conn-1");
+    expect(invoke).toHaveBeenCalledWith("clear_query_history", { connectionId: "conn-1" });
+  });
 });