feat(flow): harden host handoff, session UX, and Live Activity brand

- fix(keyboard): drop unusable extensionContext.open; report the real
  result of UIApplication.open and cancel the start watchdog immediately
  on failure with clear "open OSGKeyboard" guidance instead of a 30s spin
- feat(capture): recover from audio route changes (AirPods/wired headset
  plug-unplug) and phone-call interruptions by rebuilding the engine/tap
  against the live hardware format
- feat(home): add a "Start" button in the Home footer when a session is
  inactive and permissions are granted (no-jump manual restart)
- feat(hostapps): expand the return whitelist to 46 apps (Signal, Zoom,
  Instagram, X, Douyin, Zhihu, Bilibili, Things, Firefox, ...) with
  en/zh-Hans names and synced LSApplicationQueriesSchemes
- feat(island): use a "ready" checkmark instead of a mic glyph while idle
  and set a staleDate so an orphaned Live Activity fades after a force-quit
- feat(coldstart): use the template OSG brand mark instead of a system
  waveform glyph in the cold-start overlay
- perf(keyboard): rely on Darwin notifications as the primary session
  signal and drop the fallback poll from 1s to 3s
- fix(keyboard): remove the redundant "Start" text button next to the
  inactive-session hint on the keyboard
- docs: correct the per-take cap to 210s (3.5 min) and document that
  force-quitting no longer resurrects the session (tracker + READMEs)

OSGKeyboard/en.lproj/Localizable.strings

@@ -296,6 +296,7 @@
 "home.flow.start" = "Start voice session";
 "home.flow.end" = "End voice session";
 "home.flow.endShort" = "End";
+"home.flow.startShort" = "Start";
 "home.preview.label" = "Try typing";
 "home.preview.placeholder" = "Tap to type and test…";
 "home.stats.dictationDuration" = "Dictation time";
@@ -405,3 +406,27 @@
 "hostApp.chrome" = "Chrome";
 "hostApp.weibo" = "Weibo";
 "hostApp.xiaohongshu" = "RED";
+"hostApp.signal" = "Signal";
+"hostApp.kakaotalk" = "KakaoTalk";
+"hostApp.viber" = "Viber";
+"hostApp.zalo" = "Zalo";
+"hostApp.skype" = "Skype";
+"hostApp.zoom" = "Zoom";
+"hostApp.things" = "Things";
+"hostApp.todoist" = "Todoist";
+"hostApp.evernote" = "Evernote";
+"hostApp.onenote" = "OneNote";
+"hostApp.spark" = "Spark";
+"hostApp.firefox" = "Firefox";
+"hostApp.edge" = "Edge";
+"hostApp.facebook" = "Facebook";
+"hostApp.instagram" = "Instagram";
+"hostApp.x" = "X";
+"hostApp.threads" = "Threads";
+"hostApp.snapchat" = "Snapchat";
+"hostApp.reddit" = "Reddit";
+"hostApp.pinterest" = "Pinterest";
+"hostApp.zhihu" = "Zhihu";
+"hostApp.bilibili" = "Bilibili";
+"hostApp.douyin" = "Douyin";
+"hostApp.tiktok" = "TikTok";