feat(desktop): honest, unified dictation popups with Esc to cancel

Wave 3 of the 2026-09-28 design overhaul.

- Esc (no modifiers) cancels an in-progress dictation, recording or
  processing: VoiceModeService.requestEscape() queues the dead 'escape'
  action. Clicking the capsule cancels only while recording, so a stray
  click during processing no longer throws the text away.
- Errors show in the user's language: bootstrap now passes error.code to
  the tip (the translated branch never ran), and one core classifier
  (voice-error-message) feeds both the tip and the main-window alert.
- Capsule: bars stay flat without input (no fake "alive" wobble before the
  mic opens), an indeterminate bar replaces the made-up percentage, the
  partial transcript stays visible while processing, an Esc hint, and a
  brief "Inserted" state so success is visible.
- All six popups share popups/_shared (Pretendard, one panel radius,
  selection, kbd hints, reduced motion). History/command popups get
  titles, listbox roles and window sizes from popup-list-geometry (empty
  states were clipped); the command popup's "0" key is registered;
  result popup explains why it appeared and can be closed; captions keep
  a theme-independent dark backing on purpose.
- Popup themes follow the OS when set to system and the document lang
  follows the app language.
- Site hero demo mirrors the new capsule (done state, indeterminate bar,
  Esc hint; 10 locales).

apps/desktop/tests/main/windows/popup-redteam-r2-3.test.ts

@@ -15,6 +15,7 @@ interface FakeWebContents {
   send: (channel: string, data: unknown) => void
   isDestroyed: () => boolean
   insertCSS: () => Promise<string>
+  executeJavaScript: () => Promise<unknown>
   invalidate: () => void
   setWindowOpenHandler: () => void
 }
@@ -56,6 +57,7 @@ vi.mock('electron', () => {
       },
       isDestroyed: () => false,
       insertCSS: async () => '',
+      executeJavaScript: async () => undefined,
       invalidate: () => undefined,
       setWindowOpenHandler: () => undefined
     }
@@ -91,6 +93,8 @@ vi.mock('electron', () => {
 
   const scaled = (value: number): number => Math.round(value / state.scale)
   return {
+    // 팝업 테마: 시스템 테마 해석(2026-09-28)
+    nativeTheme: { shouldUseDarkColors: true, on: () => undefined, removeListener: () => undefined },
     app: { quit: vi.fn(), getPath: vi.fn(() => '.'), on: vi.fn(), getVersion: vi.fn(() => '1.0.0'), isPackaged: false },
     BrowserWindow: Object.assign(FakeBrowserWindow, { getAllWindows: vi.fn(() => []) }),
     screen: {