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Public Access
Replaces the single custom_theme_colors blob (one palette per user) with a proper CustomTheme table -- users can now save, name, and switch between as many custom palettes as they like, not just one. Data model: users.active_custom_theme_id references whichever saved CustomTheme (if any) is currently active; theme='custom' + that id together determine what's rendered. The migration data-migrates any already-saved single palette into a named CustomTheme row on upgrade, and best-effort backfills the active one back into the old column shape on downgrade. New endpoints under /api/custom-themes: list, create, rename/recolor, delete (falls back the user to a preset if the deleted theme was active, so the two theme columns can never disagree), and activate. UserRead.active_custom_theme is only populated when theme == 'custom' even though the DB deliberately keeps the id set while a preset is active, so switching to a preset and back doesn't lose the saved palette. ProfileModal now lists saved themes as swatches (click to activate, pencil to edit -- active or not, trash to delete with a confirm), plus a "+ New" button that creates, activates, and opens the editor for a fresh theme immediately. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>