Add streaming ASR partial transcripts and reset hosts to env default

- Stream partial transcripts to the client during dictation for live feedback
- Use OpenAI semantic VAD instead of manual commit intervals for better word boundaries
- Append silence tail on finish to flush final utterance through VAD
- Skip committing silence-only audio tails
- Reset hosts to env-defined daemon when env var is present, overriding stored state

packages/app/src/contexts/daemon-registry-context.tsx

@@ -329,6 +329,14 @@ function migrateLegacyToHostProfile(legacy: LegacyDaemonProfile): HostProfile {
 
 async function loadDaemonRegistryFromStorage(): Promise<HostProfile[]> {
   try {
+    // When env vars define a default daemon, always reset to that daemon only.
+    // This ensures the app uses the configured daemon regardless of stored state.
+    const envDefaults = parseEnvDaemonDefaults();
+    if (envDefaults.length > 0) {
+      await AsyncStorage.setItem(REGISTRY_STORAGE_KEY, JSON.stringify(envDefaults));
+      return envDefaults;
+    }
+
     const stored = await AsyncStorage.getItem(REGISTRY_STORAGE_KEY);
     if (stored) {
       const parsed = JSON.parse(stored) as unknown;
@@ -390,12 +398,6 @@ async function loadDaemonRegistryFromStorage(): Promise<HostProfile[]> {
       }
     }
 
-    const envDefaults = parseEnvDaemonDefaults();
-    if (envDefaults.length > 0) {
-      await AsyncStorage.setItem(REGISTRY_STORAGE_KEY, JSON.stringify(envDefaults));
-      return envDefaults;
-    }
-
     // No implicit localhost fallback: a fresh install starts with zero hosts.
     return [];
   } catch (error) {