feat(flow): Live Activity Dynamic Island branding and mis PrimaryLanguage

- Add OSGKeyboardLiveActivity widget extension (ActivityKit) with branded
  compactLeading mark in the Dynamic Island during Flow sessions
- Wire FlowLiveActivityController into FlowSessionManager lifecycle
- Set keyboard PrimaryLanguage to mis in project.yml, Info.plist, and at runtime
- Enable NSSupportsLiveActivities on main app and widget extension targets

Co-authored-by: Rocky <hkgood@users.noreply.github.com>

OSGKeyboardExt/Info.plist

@@ -34,7 +34,7 @@
 			<key>PrefersRightToLeft</key>
 			<false/>
 			<key>PrimaryLanguage</key>
-			<string>en-US</string>
+			<string>mis</string>
 			<key>RequestsOpenAccess</key>
 			<true/>
 		</dict>

OSGKeyboardExt/KeyboardViewController.swift

@@ -54,6 +54,8 @@ public final class KeyboardViewController: UIInputViewController {
 
     public override func viewDidLoad() {
         super.viewDidLoad()
+        // Voice-first keyboard — hide the misleading "English" subtitle in Settings.
+        primaryLanguage = "mis"
         OSGLog.keyboardExt.info("viewDidLoad — extension booted")
         CustomLanguageModelManager.shared.prepareInBackgroundIfNeeded()
         setNeedsUpdateOfScreenEdgesDeferringSystemGestures()