feat(frontend): direct title details to TMDB

[apantaz]

Summary

• Direct title-card and search-result details to TMDB
• Add explicit “View details on TMDB” actions
• Keep provider watch links separate from metadata links
• Remove the outdated internal title-details message
• Document TMDB as the canonical rich-details destination
• Mark v0.5 as a release candidate
• Defer Leaving Soon until reliable expiration data is available

Validation

• 25 frontend tests passed
• ESLint and TypeScript checks passed
• Production frontend build passed
• dbt compile and parse passed
• Secret detection and coverage checks passed