Resolution dropdown, list-focus preservation, unified dark theme, startup logging, and memory map

- Bottom-bar resolution dropdown (1080p60/1080p30/720p60/480p30) with tooltip
  on finding upload bandwidth; disabled while live; no in-app speed test
- FocusPreservingListBox keeps selection/focus coherent when a selected
  scene/source is deleted (skip hidden scenes; leave list when empty)
- Themes/Controls.xaml: single dark-theme dictionary merged once in App.xaml;
  custom ComboBox template fixes SelectionBoxItem rendering; GoLiveWindow and
  ReuseImageDialog consolidated onto shared styles
- AppLog file logger + AppDomain/Dispatcher exception hooks; checkpointed
  MainWindow/VM/dialog constructors (caught MenuItemRole.Separator XAML crash)
- Memory map: schema.md conventions, per-directory index.md, updated ai.md/
  TASKS.md/README.md (OAuth creds real; token persistence still pending)

TASKS.md

@@ -1,5 +1,8 @@
 # ytLlive — Task List
 
+> Task queue and authoritative research. Memory-map conventions: [`schema.md`](schema.md);
+> architecture/decisions: [`ai.md`](ai.md). Update statuses here whenever a task moves.
+
 ## YouTube Live API — research facts (authoritative, v3 build)
 
 Lifecycle: `created → ready → [testing] → live → complete` (transitional `liveStarting` / `testStarting`).
@@ -71,9 +74,9 @@ Lifecycle: `created → ready → [testing] → live → complete` (transitional
 
 ### Status: 🔶 UI flow done — auth wiring pending
 - ✅ Two-state Start/End Stream button, go-live dialog (account + title/description/visibility), red top bar, pulsing LIVE badge + elapsed timer, preview glow, taskbar red dot
-- ⬜ Real OAuth2 with the baked-in Google credentials (desktop client type; loopback callback, no redirect registration)
+- ✅ Real OAuth2 wiring — baked-in Google credentials (desktop client; loopback callback) + `YouTubeAuthService` complete: browser launch, `HttpListener` callback, token exchange, refresh, channel fetch
 - ⬜ Token persistence via Windows DPAPI, reload on startup
-- ⬜ Account sign-in/change wired to YouTubeAuthService (currently simulated in GoLiveViewModel)
+- ⬜ Account sign-in/change surfaced in the GoLive dialog (GoLiveViewModel still simulates it)
 
 ---