feat: Improve podcast maker UX and fix bugs

Frontend:
- Add progress modals with educational content for analysis and voice cloning
- Improve tab navigation in AnalysisPanel (combine Titles, Hook, CTA into one tab)
- Fix tab styling to make inactive tabs visible
- Fix avatar 'Make Presentable' not updating preview (blob URL handling)
- Improve mobile responsiveness for avatar tabs
- Clean up verbose console logging (AnalysisPanel, demoMode, RobustCamera)
- Add sequential progress messages instead of cycling

Backend:
- Fix 'Depends object has no attribute get' error in auth and image editing
- Use get_session_for_user instead of get_db outside FastAPI DI context
- Reduce WARNING logs to DEBUG in audio handler
- Add proper emphasis boolean handling in script generation
- Add missing fields to PodcastScene and PodcastSceneLine models
- Fix voice cloning cost estimate display issue

backend/api/podcast/handlers/avatar.py

@@ -114,6 +114,9 @@ async def make_avatar_presentable(
     Transform an uploaded avatar image into a podcast-appropriate presenter.
     Uses AI image editing to convert the uploaded photo into a professional podcast presenter.
     """
+    # CRITICAL: Log at the very start before any logic
+    logger.info(f"[Podcast] ===== MAKE PRESENTABLE ENDPOINT START =====")
+    
     user_id = require_authenticated_user(current_user)
     logger.info(f"[Podcast] Make presentable request received - user_id={user_id}, avatar_url={avatar_url}, project_id={project_id}")