Replace flashcard and quiz tools with visualization workflows

[phinaldoo]

Quiz and flashcard requests now use create_visualization. Remove their dedicated schemas, execution paths, model/admin options, icons, fixed study UI, obsolete translations, and tool-specific docs. Visualization’s automatically injected authoring guide now covers quizzes, recall ratings, review queues, accessibility, saved progress, and useful follow-up context; no separate skill installation is required.

• Saved/imported model and BYOK tool selections resolve to Visualization, including admin editors. Legacy rate-limit keys continue to match it under existing policy precedence. Those budgets now cover other visualization activities too.
• Historical study messages remain readable as expandable questions/cards with answers and explanations. Existing reviewed public-share projections and backup formats remain supported. Historical labels and compatibility aliases are intentionally retained.
• Update study guides and all 11 locales. Net removal: 1,275 lines.

Validation

• Backend suite: 4,171 passed, 11 skipped; after the final BYOK editor fix, 104 group/compatibility tests passed.
• Frontend: 1,333 passed; JavaScript ESLint, Python Ruff E9/F821, and git diff --check passed.
• Both example fragments passed the actual tool dispatcher’s validate and render actions.
• Browser: correct/wrong quiz answers, duplicate submission, scoring, retry missed, completion/reset, keyboard Space/Tab/Enter, and reload restoration. Flashcards: reveal, Again/Hard bounded queues, Got it mastery, shuffle, reverse/reset, completion, and reload restoration. Both fit 320px without horizontal overflow; flashcards also checked in dark mode.

Visual proof

These are unedited browser captures of authored example fragments using the production validator, renderer, sandbox, toolbar, and saved-state service. The fixture uses SQLite and a fixed identity; this is not a live-provider generation test or an authenticated full-app session. Generated layouts depend on the selected model and request.

Screenshots and reproducible fixtures live on a separate evidence branch, so no demo or screenshot files are added to the implementation tree.

Quiz: an incorrect answer shows its explanation and saved progress.

Flashcards: revealed answer and mastery progress restored after a page reload.

320px viewport, dark theme, reversed recall direction.

[coderabbitai]

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