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/layout/ActionRow.tsx

@@ -17,6 +17,7 @@ interface ActionRowProps {
 
 export function ActionRow({ onImport, onExport, onNewFolder, onFilters: _onFilters, onDeleteSelected, visibleItemIds = [] }: ActionRowProps) {
   const setActiveView = useUiStore((s) => s.setActiveView);
+  const openSettings = useUiStore((s) => s.openSettings);
   const selectedItemIds = useUiStore((s) => s.selectedItemIds);
   const selectAllItems = useUiStore((s) => s.selectAllItems);
   const clearSelection = useUiStore((s) => s.clearSelection);
@@ -84,7 +85,7 @@ export function ActionRow({ onImport, onExport, onNewFolder, onFilters: _onFilte
       </div>
       <div className="flex items-center gap-2 ml-auto">
         <ImportExportMenu onImport={onImport ?? (() => {})} onExport={onExport ?? (() => {})} />
-        <Button variant="ghost" className="text-xs" onClick={() => setActiveView("settings")}>
+        <Button variant="ghost" className="text-xs" onClick={openSettings}>
           <SettingsIcon size={14} /> Settings
         </Button>
       </div>