Replace folders, Notes, and Todos with a versioned Canvas library

[phinaldoo]

Files now has a flat, type-based library, and Canvas is the single place for documents, notes, and Markdown checklists. The separate folder, Notes, and Todo features are removed from the UI, APIs, model tools, settings, and exports.

Changes

• Show categories and counts from accessible files: Canvas, PDFs, images, slides, spreadsheets, documents, audio, video, archives, and other files. Add New Canvas directly to Files.
• Keep immutable Canvas versions, preview/download/restore them, and reject stale edits. Restoring retains the version it replaces. History bytes count toward storage quotas.
• Manage viewer/editor access per file. Shared editors can edit without taking ownership; history access begins when editor access was granted.
• Let the model discover existing Canvas documents by title and then view/edit their current revision. Preserve discovery references for follow-up turns.
• Include versions and memberships in file backup/restore, and convert content from older Notes/Todo archives. Update all 11 locales and remove obsolete UI strings.

Upgrade behavior

The transactional migration converts existing Notes (including history), Todo lists (including task metadata), and accepted sharing permissions into Canvas files and per-file access. It replaces automation note attachments with file attachments before removing the retired tables/columns. Existing uploaded files remain in the flat library.

Old Notes, Todo, and folder share URLs are retired; owners can create new Canvas links. This conversion requires a pre-upgrade backup for rollback, as documented in README.

Validation

• Backend: 4,045 passed, 11 skipped.
• Frontend: 1,253 passed.
• PostgreSQL migration smoke tests: 2 passed, plus a populated migration regression test.
• JavaScript/Python lint, translation parity (11 languages, 14 pages), and diff whitespace checks passed.
• Browser: category filtering, Canvas creation, historical source preview/restore, a checkbox save surviving reload, per-document access changes, and mobile editor/history layout.

Visual proof

These screenshots use the production Files/Canvas components and FastAPI file routes with isolated fixture data. The fixture bypasses authentication/quota admission; category samples are synthetic and do not prove PDF/image/slide rendering. Screenshots are on a separate evidence branch, with no proof files added to /docs or this application branch.

Dynamic file categories

Canvas checklist after saving and reloading

Version preview, restore, and document access

Mobile editor and history

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