Add timestamp to default export backup name

[Crustack]

Closes #790

Summary by CodeRabbit

• New Features
  • Backup files now include timestamps in their filenames, making them easier to organize and distinguish from one another.

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📝 Walkthrough

Walkthrough

The PR adds a timestamped backup filename feature by introducing a new buildBackupTitle() helper function in SettingsFragment that generates backup filenames in the format "NotallyX Backup yyyy-MM-dd HH-mm.zip". This replaces two hard-coded backup title strings with dynamic, timestamp-based filenames in both biometric and standard backup export flows.

Changes

Cohort / File(s)	Summary
Backup Filename Timestamping app/src/main/java/com/philkes/notallyx/presentation/activity/main/fragment/settings/SettingsFragment.kt	Added buildBackupTitle() private function to generate timestamped backup filenames; imported SimpleDateFormat and Locale; replaced two hard-coded "NotallyX Backup.zip" strings with dynamic function calls in biometric and export backup flows

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~4 minutes

Poem

🐰 Hop, hop, the backups now have dates,
No more nameless file fates!
Timestamped treasures, organized and neat,
Every backup's name is sweet! 🎉

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding a timestamp to the default export backup filename.
Linked Issues check	✅ Passed	The code changes implement the requested feature by adding timestamped backup filenames in the format 'NotallyX Backup yyyy-MM-dd HH-mm.zip'.
Out of Scope Changes check	✅ Passed	All changes are scoped to the backup filename generation functionality with no unrelated modifications present.

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