feat(dashboard): since quick-filter presets in events FiltersModal

[Xore]

Summary

• Add `since` quick-filter to events FiltersModal with a `` of Parser-proven presets (24h/7d/30d/90d/365d), matching backend `since_to_range` date-math.
• Wired into badge count, apply, and clear.

Discovery

`attack_path` (the plan's other suggestion) does not exist anywhere in the codebase — verified repo-wide — so it is deliberately not added here. This is a backend-data gap; to be filed as a discovery issue for a future PR, not this one.

Test plan

• Open events page, verify FiltersModal shows since presets
• Apply a preset, confirm badge count updates and results filter correctly
• Clear filters, confirm since resets

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None