Integrate OPDS catalogs and book details refinements

[Eoic]

Summary

Update the submodule references so a Papyrus checkout includes OPDS catalog browsing and imports, persistent import tracking, cached feeds, and the catalog/library interface refinements.

• Client: d9fa2c7, including Add OPDS catalogs with feed caching and persistent import tracking client#25.
• Server: bfc4fbc, the anonymous OPDS resource relay already published on master.
• Reader: b3fc338, the HTML/PDF dependency compatibility fixes and example lockfile update in Fix reader HTML and native PDF dependency compatibility reader#2.

The client and reader commits have been pushed. Merge their PRs before integrating this parent reference update.

Validation

• Client: 1,371 Flutter tests passed, 19 skipped; four web restart tests passed.
• Client formatting and static analysis passed; the release web build succeeded.
• Reader: 93 tests passed, 21 skipped; formatting and static analysis passed.
• Reader example: 2 tests passed; static analysis, Linux/web release builds, and flutter pub get --enforce-lockfile passed.
• git diff --check passed and the working tree is clean.

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