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)

OSGKeyboardLiveActivity/FlowLiveActivityWidget.swift

@@ -61,33 +61,24 @@ private struct FlowLiveActivityLockScreenView: View {
             Spacer(minLength: 0)
             FlowLiveActivityTrailingGlyph(phase: phase)
         }
-        .padding(.horizontal, 4)
+        // iOS Live Activity lock-screen content needs margins so the leading
+        // logo and trailing glyph don't touch the card edges.
+        .padding(.horizontal, 16)
+        .padding(.vertical, 12)
     }
 }
 
 /// Branded mark used in compactLeading so users see OSGKeyboard, not the system mic icon.
+/// Transparent white OSG glyphs render directly on the black Dynamic Island.
 private struct FlowLiveActivityBrandMark: View {
     let size: CGFloat
 
     var body: some View {
-        ZStack {
-            Circle()
-                .fill(
-                    LinearGradient(
-                        colors: [
-                            Color(red: 0.35, green: 0.55, blue: 1.0),
-                            Color(red: 0.22, green: 0.38, blue: 0.92)
-                        ],
-                        startPoint: .topLeading,
-                        endPoint: .bottomTrailing
-                    )
-                )
-            Image(systemName: "keyboard")
-                .font(.system(size: size * 0.48, weight: .semibold))
-                .foregroundStyle(.white)
-        }
-        .frame(width: size, height: size)
-        .accessibilityLabel("OSGKeyboard")
+        Image("OSGLogo")
+            .resizable()
+            .aspectRatio(contentMode: .fit)
+            .frame(width: size, height: size)
+            .accessibilityLabel("OSGKeyboard")
     }
 }
 
@@ -105,8 +96,10 @@ private struct FlowLiveActivityTrailingGlyph: View {
                 .progressViewStyle(.circular)
                 .tint(.white)
         case .idle:
-            Image(systemName: "mic.fill")
-                .foregroundStyle(.secondary)
+            // Session ready but NOT listening — avoid a mic glyph so users
+            // don't think the keyboard is recording in the background.
+            Image(systemName: "checkmark.circle.fill")
+                .foregroundStyle(.green)
         }
     }
 }