Settings: db-viewer redesign, theme/accent wiring, macOS overlay titlebar (#6)

* feat: settings back button returns to origin view (push/pop nav)

* feat: redesign settings screen with db-viewer border styling

* fix: settings sidebar — icon+text tabs, back at top, top border (PR feedback)

* fix: tighten settings sidebar — back and tabs in one group

* fix: settings header shows active tab name instead of duplicated title

* fix: settings — accent back button, header shows active tab; fix App test

* fix: tags settings — no create label, no card chrome (bg/border/padding)

* feat: drag-and-drop tag reordering in settings tags tab

* fix: general settings — remove section card chrome (bg/border/padding)

* fix: merge Appearance and Interface into one settings section

* fix: remove row separators between settings items within sections

* fix: settings rows use gap spacing instead of per-row padding

* feat: strip section cards from all settings tabs; delete SettingsSection

* feat: apply theme and font size settings (appearance wiring)

* feat: honor default folder setting on startup

* feat: confirm_before_delete setting now skips delete confirmations

* feat: default_ports setting prefills new connection forms

* fix: light theme — text colors, native window chrome, ThemePicker preview

* fix: sync window background color with theme so title bar follows light mode

* fix: window-sync test uses microtask flush instead of vi.waitFor

* fix: app root carries canvas bg so home-screen parent matches theme

* fix: grant window set-theme/set-background-color permissions so title bar follows theme

* fix: overlay title bar — webview paints under traffic lights, flat canvas color in both themes

* fix: compact 28px overlay titlebar with visible bottom border

* fix: in-flow titlebar strip (draggable via allowed permission); screens fill remaining height, no bottom clipping

* fix: top border only on settings + db viewer pages, not the titlebar strip

* fix: db viewer sidebar h-screen -> h-full (28px overflow clipped bottom icons)

* fix: system theme resets window to OS before reading matchMedia (was polluted by forced window theme)

* fix: theme switcher labels moved below previews for readability

* feat: configurable accent color setting (circle palette in Appearance)

* docs: update AGENTS.md + README for settings redesign, wired settings, accent color

src/components/db-viewer/DbViewerScreen.tsx

@@ -981,7 +981,7 @@ const onQueriesPanelResizeStart = useCallback(
 
     return (
         <TooltipProvider>
-            <div className="h-screen bg-canvas flex border-t border-border">
+            <div className="h-full bg-canvas flex border-t border-border">
                 <DbViewerSidebar
                     currentView={currentView}
                     onNavigate={handleNavigate}

src/components/db-viewer/DbViewerSidebar.tsx

@@ -71,7 +71,7 @@ export function DbViewerSidebar({
     }
 
     return (
-        <div className="w-14 h-screen bg-canvas border-r border-border flex flex-col items-center py-3 gap-2 shrink-0">
+        <div className="w-14 h-full bg-canvas border-r border-border flex flex-col items-center py-3 gap-2 shrink-0">
             <div className="flex flex-col gap-2 flex-1">
                 {topItems.map(renderItem)}
             </div>