feat(flux): Modell-Wahl per Diagnostic + raw/switch-Keywords + Download-Hinweis

Diagnostic-Einstellungen fuer FLUX:
- Default-Modell (dev | schnell) — wird via RVS gepusht, flux-bridge
  hot-swappt die Pipeline aus dem HF-Cache (~15-30s)
- Raw-Keyword (Default 'flux') — Pipe-Modus, Brain leitet Stefans Text
  1:1 als prompt durch, kein Rewriting/Beautify
- Switch-Keyword (Default 'fix') — zwingt das ANDERE Modell als Default

Brain-Tool flux_generate um model + raw erweitert, System-Prompt-Block
mit den aktuellen Diagnostic-Settings + Whisper-Toleranz-Hinweis.

Kein eager Bootstrap-Load: flux-bridge wartet auf config oder ersten
Request. Bei erstem HF-Download zeigt Banner "laedt erstmalig runter"
mit Pfeil-Icon, Toast in der App wenn fertig.

FLUX_MODEL aus der .env entfernt (Steuerung jetzt komplett ueber
Diagnostic). HF_TOKEN-Kommentar erklaert warum trotz lokaler Inference
noetig (HF Gate-Mechanismus fuer FLUX.1-dev).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/src/screens/ChatScreen.tsx

@@ -290,7 +290,7 @@ const ChatScreen: React.FC = () => {
   // Stream zumuellen. Eigentlich seltener Fall, aber billig zu pruefen.
   const lastThoughtKeyRef = useRef<string>('');
   // Service-Status (Gamebox: F5-TTS / Whisper Lade-Status) + Banner-Sichtbarkeit
-  const [serviceStatus, setServiceStatus] = useState<Record<string, {state: string, model?: string, loadSeconds?: number, error?: string}>>({});
+  const [serviceStatus, setServiceStatus] = useState<Record<string, {state: string, model?: string, loadSeconds?: number, error?: string, downloading?: boolean, freshlyDownloaded?: boolean}>>({});
   const [serviceBannerDismissed, setServiceBannerDismissed] = useState(false);
   // Gerätelokale TTS-Config: globaler Toggle (aus Settings) + temporäres Muten (Mund-Button)
   const [ttsDeviceEnabled, setTtsDeviceEnabled] = useState(true);
@@ -1171,22 +1171,39 @@ const ChatScreen: React.FC = () => {
         }
       }
 
-      // Gamebox-Bridges (f5tts/whisper) melden Lade-Status — Banner oben
+      // Gamebox-Bridges (f5tts/whisper/flux) melden Lade-Status — Banner oben.
+      // Toast bei Download-Ende: erstmaliger HF-Download (mehrere GB) → User
+      // soll wissen dass er Bilder/Stimmen jetzt nutzen kann ohne in den
+      // Banner gucken zu muessen.
       if (message.type === ('service_status' as any)) {
         const p = message.payload as any;
         const svc = (p?.service as string) || '';
         if (!svc) return;
+        const newState = (p?.state as string) || 'unknown';
+        const freshlyDownloaded = p?.freshlyDownloaded === true;
         setServiceStatus(prev => ({
           ...prev,
           [svc]: {
-            state: (p?.state as string) || 'unknown',
+            state: newState,
             model: p?.model as string | undefined,
             loadSeconds: p?.loadSeconds as number | undefined,
             error: p?.error as string | undefined,
+            downloading: p?.downloading === true,
+            freshlyDownloaded,
           },
         }));
         // Bei neuer Loading-Phase Banner wieder aktivieren
-        if (p?.state === 'loading') setServiceBannerDismissed(false);
+        if (newState === 'loading') setServiceBannerDismissed(false);
+        // Download-Fertig-Toast: Bridge setzt freshlyDownloaded=true bei dem
+        // 'ready'-Broadcast direkt nach einem Cache-Miss-Load. Ein einziger
+        // Toast pro Modell-Download, kein State-Tracking auf App-Seite noetig.
+        if (newState === 'ready' && freshlyDownloaded) {
+          const niceName = svc === 'flux' ? 'FLUX' : svc === 'f5tts' ? 'F5-TTS' : svc === 'whisper' ? 'Whisper' : svc;
+          const model = p?.model ? ` (${p.model})` : '';
+          try {
+            ToastAndroid.show(`${niceName}-Modell heruntergeladen${model} — jetzt einsatzbereit`, ToastAndroid.LONG);
+          } catch {}
+        }
       }
     });
 
@@ -2196,7 +2213,7 @@ const ChatScreen: React.FC = () => {
         const allReady = !anyLoading && !anyError && entries.every(([, v]) => v.state === 'ready');
         const bg = anyError ? '#3A1F1F' : anyLoading ? '#3A331F' : '#1F3A2A';
         const border = anyError ? '#FF3B30' : anyLoading ? '#FFD60A' : '#34C759';
-        const labels: Record<string, string> = { f5tts: 'F5-TTS', whisper: 'Whisper STT' };
+        const labels: Record<string, string> = { f5tts: 'F5-TTS', whisper: 'Whisper STT', flux: 'FLUX Image-Gen' };
         return (
           <TouchableOpacity
             activeOpacity={allReady ? 0.6 : 1.0}
@@ -2206,11 +2223,16 @@ const ChatScreen: React.FC = () => {
             {entries.map(([svc, info]) => {
               let icon = '\u23F3', text = '';
               if (info.state === 'loading') {
-                text = `${labels[svc] || svc}: laedt${info.model ? ' ' + info.model : ''}...`;
+                icon = info.downloading ? '\u2B07' : '\u23F3'; // \u2B07 vs \u23F3
+                const action = info.downloading
+                  ? 'laedt erstmalig runter (mehrere GB, kann dauern)'
+                  : 'laedt';
+                text = `${labels[svc] || svc}: ${action}${info.model ? ' ' + info.model : ''}...`;
               } else if (info.state === 'ready') {
-                icon = '\u2705';
+                icon = info.freshlyDownloaded ? '\uD83C\uDF89' : '\u2705'; // \uD83C\uDF89 vs \u2705
                 const sec = info.loadSeconds ? ` (${info.loadSeconds.toFixed(1)}s)` : '';
-                text = `${labels[svc] || svc}: bereit${info.model ? ' ' + info.model : ''}${sec}`;
+                const dl = info.freshlyDownloaded ? ' \u2014 Download fertig!' : '';
+                text = `${labels[svc] || svc}: bereit${info.model ? ' ' + info.model : ''}${sec}${dl}`;
               } else if (info.state === 'error') {
                 icon = '\u274C';
                 text = `${labels[svc] || svc}: Fehler ${info.error || ''}`;