feat: media picker and image removal

features/media_library.qa.md

@@ -7,7 +7,7 @@ Package: `test` (black-box). New file `test/media_library_http_test.go`. Fake ty
 2. Rewrite `mockImageRepo` (`test/image_test.go`) to the new `image.Repository`: Create (stores the metadata from the ImageInput and derives a `/static/uploadedImages/<n>.<ext>` path), Get, Delete (records calls, honours `failDeleteFor`), List(query), FindByHash, Rename, ListByHash groups, Counts. Add fields for seeding `Filename`, `Size`, `ContentType`, `Width`, `Height`, `SHA256`, `UploadedByID`, `CreatedAt`.
 3. Extend `mockArticleRepo` (`test/article_test.go`) with `FindByBodyContaining(filename)` (substring over `Body`) and a per-id failure switch for `UpdateBody`. Remove `AddImage` and the article `Images` field from the fake and from every test that uses them.
 4. Use the existing user fake so `uploaded_by` resolves: user 1 display name "Inès Duarte", user 2 username "marta" with empty display name.
-5. Wire the real use cases over the fakes: create, list, rename, delete, merge and usage media use cases, `NewCreateImageUseCase(imageRepo)`, `NewGetUserUseCase(userRepo)`. Build `media.NewHandler(...)` (`api/handlers/media`) and `image.NewHandler(...)` for the alias.
+5. Wire the real use cases over the fakes: create, list, rename, delete, merge and usage media use cases, `NewCreateImageUseCase(imageRepo)`, `NewGetUserUseCase(userRepo)`. Build `media.NewHandler(...)` (`api/handlers/media`).
 6. Build `jwtauth.New("HS256", []byte("test-secret"), nil)`. Mount on a fresh `chi.NewRouter()` mirroring `api/router.go`: `jwtauth.Verifier` at the top, then in the media group `Authenticator`, `RequireCurrentToken(getUser)`, `RequireVerifiedUser(getUser)`, with the six routes under `/v1/media`.
 7. Mint cookies via `token.Encode(map[string]any{"user_id": uint32(n), ...})` as in the other HTTP tests. Build a stale-token cookie with a `token_version` lower than the user's, and use an unverified user for the 403 case.
 8. Build multipart bodies with `mime/multipart.Writer`, using `CreatePart` with an explicit part `Content-Type` header. Generate real bytes in the test: