Fix Sharp Library bottle folder affordance

[aaf2tbz]

Summary

Replace the broken Sharp Library Add Asset flow with a working Tools → Open Folder action that opens the selected app's bottle prefix in Finder for manual file placement.

Changes

• Remove the calls to the unimplemented asset picker and /sharp-library/add-asset endpoint.
• Open the selected app's own bottle prefix and disable the action if no bottle is linked.
• Document manual placement and keep managed runtime components on the runtime/bottle repair path.
• Add a regression check for the action's bottle lookup and Finder wiring.

PR Readiness (MANDATORY)

• Real-game launch test completed for game/runtime/graphics/compatibility changes (game + method below; otherwise mark N/A)
• No hardcoded paths, secrets, or absolute /Users/... paths introduced
• Config/rules TOML validated if configs/mtsp-rules.toml or DLL maps changed
• Version metadata (CMakeLists.txt, app/src-c/Makefile, package.json, package-lock.json) in sync if version bumped
• Bottle/runtime migration and launch behavior preserved (rollback plan noted if changed)
• Docs / compatibility matrix updated for user-facing changes
• Regression test added for each bug fix

Test notes

• cd app && npm run build — passed (TypeScript and Vite production build).
• node app/tests/sharp-library-open-bottle-folder.cjs — passed.
• git diff --check — passed.
• Real-game launch test: N/A; this change only opens the existing app bottle folder in Finder and does not alter launch/runtime behavior.

Risk

Low. The action uses the existing Finder bridge and bottle prefix path; rollback is reverting this commit. Managed runtime components remain governed by existing repair mechanisms.