fix: standardize /toggle-favourite response model and error envelope

[nishtha-agarwal-211]

Fixes #1479

Additional Notes:

Backend changes:

• Added ToggleFavouriteResponse Pydantic model in backend/app/schemas/images.py with typed fields (success, image_id, isFavourite)
• Updated @router.post("/toggle-favourite") in backend/app/routes/images.py to include response_model=ToggleFavouriteResponse and responses for OpenAPI metadata
• Wrapped all error paths in ErrorResponse(...).model_dump() instead of plain text strings, matching the pattern used in the videos /toggle-favourite route
• Added route-level tests in backend/tests/test_toggle_favourite.py covering success (200), not found (404), and internal server error (500) cases

Frontend changes:

• Replaced the generic APIResponse (with [key: string]: any) in frontend/src/api/api-functions/togglefav.ts with a strongly-typed ToggleFavouriteResponse interface matching the backend's Pydantic model

Summary by CodeRabbit

• Improvements

  • Favourite toggling now returns clear success details, including the image ID and updated favourite status.
  • Missing images and unexpected server errors now provide structured, informative error responses.

• Bug Fixes

  • Improved handling and reporting of failures when toggling image favourites.

• Tests

  • Added coverage for successful toggles, missing images, and server-side errors.

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• backend/tests/test_toggle_favourite.py

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• backend/tests/test_toggle_favourite.py

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Walkthrough

The /toggle-favourite endpoint now uses typed success and structured error responses. Backend tests cover success, missing images, and database errors. The frontend API function matches the backend success response shape.

Changes

Toggle favourite contract

Layer / File(s)	Summary
Backend response contract and route behavior backend/app/schemas/images.py, backend/app/routes/images.py, backend/tests/test_toggle_favourite.py	Adds ToggleFavouriteResponse, declares structured 404 and 500 responses, returns structured error payloads, and tests success and failure cases.
Frontend response typing frontend/src/api/api-functions/togglefav.ts	Replaces the generic APIResponse return type with ToggleFavouriteResponse.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🟡 Moderate · up to c69d5

The /toggle-favourite endpoint may document one error format while returning another, and its tests preserve the mismatch; clients could therefore receive unexpected 404 or 500 payloads. The PR is not merge-ready until the documented, runtime, and tested error envelopes are aligned.

Suggested labels: Python, TypeScript/JavaScript

Poem

A rabbit checks the toggle with care,
Typed fields now travel everywhere.
Errors use envelopes neat,
Tests confirm each result complete.
Hop, hop—the favourite state is clear!

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes to the /toggle-favourite response model and error envelope.
Linked Issues check	✅ Passed	The changes satisfy issue #1479 by standardizing backend models and errors, adding route coverage, and aligning the frontend type.
Out of Scope Changes check	✅ Passed	All changes support issue #1479 and the stated objective; no unrelated code changes are identified.

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Actionable comments posted: 2

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Inline comments:
In `@backend/app/routes/images.py`:
- Around line 338-353: Replace the HTTPException-based error paths in the image
toggle handler, including both sites in backend/app/routes/images.py at lines
338-353 and 366-370, with direct ErrorResponse.model_dump() bodies while
preserving their matching 404 or 500 status codes. Update
backend/tests/test_toggle_favourite.py lines 42-56 to assert error fields
directly from resp.json() rather than through a detail wrapper.

In `@backend/tests/test_toggle_favourite.py`:
- Around line 11-56: Add accurate type annotations to the client fixture and all
TestToggleFavourite test methods: annotate client with TestClient, each test
method with -> None, and type the injected mock parameters using the appropriate
mock type. Preserve the existing test behavior and fixture injection.

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Fix all unresolved CodeRabbit comments on this PR:

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• Create a new PR with the fixes

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📒 Files selected for processing (4)

• backend/app/routes/images.py
• backend/app/schemas/images.py
• backend/tests/test_toggle_favourite.py
• frontend/src/api/api-functions/togglefav.ts

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