Phase 3: Bug fixes, feature enhancements, and polish
P0 Critical: presentation isolation (client scoping), storage super_admin fix,
template selection in worker, IMAGE_PROVIDERS list fix.
P1 High: template layout management UI (delete/filter/bulk), slide-based parsing
mode, LLM model listing & connection test, settings persistence to DB (Fernet
encryption), logout button.
P2 Polish: storage improvements (master deck files, per-client breakdown, bulk
delete, hard purge, client selector), image generation error visibility
(__image_error__ badge), hamster wheel loading animation.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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