fix(voice-clone): persist clone info in localStorage, auto-merge into project knobs, fix clone ID detection in CreateModal

- Move voice clone cache from module-level memory to localStorage
  so it survives page refresh and works across browser tabs
- VoiceAvatarPlaceholder now syncs clone result to localStorage
  immediately after creation (both design and clone paths)
- usePodcastProjectState auto-merges voice clone cache into project
  knobs when loading a project (fills gap for projects created
  before voice clone or when voice clone was created after)
- CreateModal now detects voice clone IDs by prefix (vc_*) not
  just by VOICE_CLONE_ID constant, fixing the mismatch where
  VoiceSelector passes the actual clone ID but CreateModal
  expected the placeholder ID
- AudioRegenerateModal is intentionally per-scene override and
  does not write back to knobs (by design)
- trends.py handler added for podcast topic trend analysis

frontend/src/components/OnboardingWizard/PersonalizationStep/components/VoiceAvatarPlaceholder.tsx

@@ -3,6 +3,7 @@ import { Box, Typography, Paper, Stack, Button, Alert, TextField, CircularProgre
 import { keyframes } from '@mui/system';
 import { Mic, GraphicEq, Timer, CloudUpload, Stop, PlayArrow, InfoOutlined, TextFields, HelpOutline, AutoAwesome, Campaign, MicNone, Podcasts, RestartAlt, Undo, Headphones, Article, VideoLibrary, TrendingUp, CheckCircle, RecordVoiceOver, Settings } from '@mui/icons-material';
 import { createVoiceClone, createVoiceDesign, getLatestVoiceClone, setBrandVoice } from '../../../../api/brandAssets';
+import { setCachedVoiceCloneInfo } from '../../../../services/podcastApi';
 import { getAuthTokenGetter, getApiUrl } from '../../../../api/client';
 import { OperationButton } from '../../../shared/OperationButton';
 
@@ -292,6 +293,13 @@ export const VoiceAvatarPlaceholder: React.FC<{ domainName?: string; onVoiceSet?
               } catch (e) {
                 console.warn('Failed to save voice selection to storage', e);
               }
+              // Also persist to cross-phase cache for Write phase
+              setCachedVoiceCloneInfo({
+                customVoiceId: customVoiceId || undefined,
+                voiceSampleUrl: resultAudioUrl || undefined,
+                engine: engine || 'qwen3',
+                isVoiceClone: true,
+              });
               if (onVoiceSet) onVoiceSet();
           } else {
               setError(resp.error || 'Failed to set brand voice');
@@ -510,6 +518,13 @@ export const VoiceAvatarPlaceholder: React.FC<{ domainName?: string; onVoiceSet?
             if (resp.success) {
                 setSuccess(resp.message || 'Voice generated successfully');
                 setResultAudioUrl(resp.preview_audio_url || null);
+                // Persist to cross-phase cache so Write phase can use it immediately
+                setCachedVoiceCloneInfo({
+                  customVoiceId: resp.custom_voice_id || undefined,
+                  voiceSampleUrl: resp.preview_audio_url || undefined,
+                  engine: resp.engine || 'qwen3',
+                  isVoiceClone: true,
+                });
             } else {
                 setError(resp.error || 'Voice generation failed');
             }
@@ -557,6 +572,13 @@ export const VoiceAvatarPlaceholder: React.FC<{ domainName?: string; onVoiceSet?
       if (resp.success) {
         setSuccess('Voice generated successfully. Use this for generating your Brand Voice.');
         setResultAudioUrl(resp.preview_audio_url || null);
+        // Persist to cross-phase cache so Write phase can use it immediately
+        setCachedVoiceCloneInfo({
+          customVoiceId: resp.custom_voice_id || customVoiceId || undefined,
+          voiceSampleUrl: resp.preview_audio_url || undefined,
+          engine: resp.engine || engine || 'qwen3',
+          isVoiceClone: true,
+        });
       } else {
         setError(resp.error || 'Voice clone failed');
       }

frontend/src/components/PodcastMaker/CreateModal.tsx

@@ -319,13 +319,19 @@ export const CreateModal: React.FC<CreateModalProps> = ({ onCreate, open, defaul
     
     // Include selected voice in knobs
     // If voice clone is selected, include voice clone metadata
-    const isVoiceClone = selectedVoiceId === VOICE_CLONE_ID || knobs.custom_voice_id === selectedVoiceId;
+    // VoiceSelector may pass VOICE_CLONE_ID, the actual clone ID (vc_*), or a system voice ID
+    const selectedLooksLikeClone = selectedVoiceId?.startsWith("vc_") || selectedVoiceId === "MY_VOICE_CLONE";
+    const isVoiceClone = selectedVoiceId === VOICE_CLONE_ID || selectedLooksLikeClone || knobs.custom_voice_id === selectedVoiceId;
     
     let voiceSampleUrl: string | undefined;
     let voiceCloneEngine: string | undefined;
     let customVoiceId: string | undefined;
     
     if (isVoiceClone) {
+      // If VoiceSelector already gave us the real clone ID, use it as fallback
+      if (selectedLooksLikeClone && selectedVoiceId !== VOICE_CLONE_ID) {
+        customVoiceId = selectedVoiceId;
+      }
       try {
         const voiceCloneInfo = await getLatestVoiceClone();
         if (voiceCloneInfo?.success && voiceCloneInfo.custom_voice_id) {

frontend/src/hooks/usePodcastProjectState.ts

@@ -11,7 +11,7 @@ import {
   PodcastBible,
 } from '../components/PodcastMaker/types';
 import { BlogResearchResponse, ResearchProvider } from '../services/blogWriterApi';
-import { podcastApi } from '../services/podcastApi';
+import { podcastApi, getCachedVoiceCloneInfo } from '../services/podcastApi';
 
 export interface PodcastProjectState {
   // Project metadata
@@ -79,6 +79,30 @@ const DEFAULT_KNOBS: Knobs = {
   bitrate: "standard",
 };
 
+/**
+ * Merge voice clone cache into knobs if the project knobs don't already have it.
+ * This ensures projects created before voice clone, or after a new clone is made,
+ * automatically pick up the latest voice clone info.
+ */
+function mergeVoiceCloneCacheIntoKnobs(knobs: Knobs): Knobs {
+  // If knobs already has a custom voice ID, trust it (user explicitly set it)
+  if (knobs.custom_voice_id) {
+    return knobs;
+  }
+  const cached = getCachedVoiceCloneInfo();
+  if (!cached || !cached.isVoiceClone) {
+    return knobs;
+  }
+  return {
+    ...knobs,
+    voice_id: knobs.voice_id || "Wise_Woman",
+    custom_voice_id: cached.customVoiceId,
+    is_voice_clone: true,
+    voice_sample_url: cached.voiceSampleUrl,
+    voice_clone_engine: cached.engine || "qwen3",
+  };
+}
+
 const DEFAULT_STATE: PodcastProjectState = {
   project: null,
   analysis: null,
@@ -446,7 +470,7 @@ export const usePodcastProjectState = () => {
         scriptData: dbProject.script_data,
         bible: dbProject.bible,
         renderJobs: dbProject.render_jobs || [],
-        knobs: { ...DEFAULT_KNOBS, ...(dbProject.knobs || {}) },
+        knobs: mergeVoiceCloneCacheIntoKnobs({ ...DEFAULT_KNOBS, ...(dbProject.knobs || {}) }),
         researchProvider: dbProject.research_provider || 'exa',
         budgetCap: dbProject.budget_cap || 50,
         showScriptEditor: dbProject.show_script_editor || false,

frontend/src/services/podcastApi.ts

@@ -38,31 +38,63 @@ const DEFAULT_KNOBS: Knobs = {
   bitrate: "standard",
 };
 
-// In-memory cache for voice clone info to avoid re-fetching per scene
-let _voiceCloneCache: {
+const VOICE_CLONE_STORAGE_KEY = "alwrity_voice_clone_info";
+const VOICE_CLONE_CACHE_TTL = 30 * 60 * 1000; // 30 minutes
+
+function _readVoiceCloneCache() {
+  try {
+    const raw = localStorage.getItem(VOICE_CLONE_STORAGE_KEY);
+    if (!raw) return null;
+    const parsed = JSON.parse(raw);
+    if (parsed && typeof parsed.timestamp === "number" && Date.now() - parsed.timestamp < VOICE_CLONE_CACHE_TTL) {
+      return parsed;
+    }
+  } catch {
+    /* ignore corrupt localStorage */
+  }
+  return null;
+}
+
+function _writeVoiceCloneCache(info: {
   customVoiceId?: string;
   voiceSampleUrl?: string;
   engine?: string;
   isVoiceClone?: boolean;
-  timestamp: number;
-} | null = null;
-const VOICE_CLONE_CACHE_TTL = 30 * 60 * 1000; // 30 minutes
-
-export function getCachedVoiceCloneInfo() {
-  if (_voiceCloneCache && Date.now() - _voiceCloneCache.timestamp < VOICE_CLONE_CACHE_TTL) {
-    return _voiceCloneCache;
+}) {
+  try {
+    localStorage.setItem(VOICE_CLONE_STORAGE_KEY, JSON.stringify({ ...info, timestamp: Date.now() }));
+  } catch {
+    /* ignore localStorage errors (e.g. quota exceeded) */
   }
-  _voiceCloneCache = null;
-  return null;
 }
 
+function _clearVoiceCloneCache() {
+  try {
+    localStorage.removeItem(VOICE_CLONE_STORAGE_KEY);
+  } catch {
+    /* ignore */
+  }
+}
+
+/**
+ * Get cached voice clone info from localStorage (survives page refresh).
+ * Returns null if expired (>30 min) or not set.
+ */
+export function getCachedVoiceCloneInfo() {
+  return _readVoiceCloneCache();
+}
+
+/**
+ * Persist voice clone info to localStorage so it survives page refresh
+ * and is available across tabs.
+ */
 export function setCachedVoiceCloneInfo(info: {
   customVoiceId?: string;
   voiceSampleUrl?: string;
   engine?: string;
   isVoiceClone?: boolean;
 }) {
-  _voiceCloneCache = { ...info, timestamp: Date.now() };
+  _writeVoiceCloneCache(info);
 }
 
 // const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
@@ -365,6 +397,32 @@ export const podcastApi = {
     return response.data;
   },
 
+  async getTrendingTopics(params: {
+    keywords: string[];
+    timeframe?: string;
+    geo?: string;
+  }): Promise<{
+    success: boolean;
+    data?: {
+      interest_over_time: any[];
+      interest_by_region: any[];
+      related_topics: { top: any[]; rising: any[] };
+      related_queries: { top: any[]; rising: any[] };
+      timeframe: string;
+      geo: string;
+      keywords: string[];
+      cached: boolean;
+    };
+    error?: string;
+  }> {
+    const response = await aiApiClient.post("/api/podcast/trends", {
+      keywords: params.keywords,
+      timeframe: params.timeframe || "today 12-m",
+      geo: params.geo || "US",
+    });
+    return response.data;
+  },
+
   async runResearch(params: {
     projectId: string;
     topic: string;