feat: content labels with self-label hydration and improved warning UX
Hydrate self-labels from record child tables for galleries and stories.
Add ContentWarningPicker to gallery and story create forms with form field
labels. Replace blur with opaque overlay and Bluesky-style warning bar
across feed, stories, and profile grid. Add label schema for stories.
Clean up orphaned CSS and normalize location input styling.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>