Fix full narration imports and complete project asset lists

[JaysonAlbert]

Full local narration stems above 15 MiB were rejected using model-reference limits, and project asset lists hid older media after 30 items per type. Local browser/MCP imports now allow audio up to 128 MiB while model references remain capped at 15 MiB. Project-scoped media lists return all project members; global recent lists stay capped at 30 per type.

Also retain the additional project-creation browser regression tests from upstream PR BeatAPI#22. Its implementation is already on this fork's main; no duplicate implementation merge is needed.

Validation:

• Typecheck, i18n check and workstation production build passed.
• Node tests: 432 passed, 2 skipped.
• Isolated Playwright checks: 6 passed, including a 16 MiB WAV upload, 32 assets per media type with project isolation/global limits, and project-creation flows.
• Tests use an isolated SQLite/media directory and a small synthetic video fixture.

Tracks ONI-128. Existing worktree edits and ignored local data are preserved separately.