Load session metadata before note content

[ComputelessComputer]

Summary

• Start session persistence with metadata-only scans.
• Hydrate full session content lazily when a note opens.
• Add focused hydration and load coverage.

---

Note

Medium Risk
Changes session load/save timing and memo deletion rules; wrong hydration or deleteEmptyMemos logic could cause missing notes or stale content, though behavior is covered by new tests.

Overview
Startup and persistence now load only session _meta.json into TinyBase; transcripts and markdown are no longer scanned on initial loadAll.

Opening a session triggers hydrateSessionContent, which loads that session’s files via loadSingleSession and merges them into the store without dropping other sessions. The note UI stays on a skeleton until hydration succeeds, with a 1s retry on failure and an in-memory cache so repeat opens skip reload.

Saves only delete _memo.md when raw_md actually changed (or on full saves), so metadata-only updates (e.g. folder moves) no longer wipe memo files while raw_md is still empty in the metadata-only store.

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