[callumalpass]

Problem

Writer already uses each SDK record’s mtime for the home list, newest first. Equal or unavailable timestamps fell back to translated title ordering, so title and locale changes could move records unnecessarily.

Changes

• Preserve per-record modification-time ordering and break ties deterministically by path.
• Keep records with missing or invalid times last; never substitute collection or sync time.
• Add coverage for timestamp projection, local session saves, synced edits, unrelated sync events, and home-list refreshes.

Tests

• rpnpm check passed (translation checks, typechecks, full unit suites).
• Final targeted app run passed: 39 Vitest tests; 77 script tests passed, 2 existing skips.
• git diff --check passed.

No release or deployment.