Add date/time range filter to events page

[MathurAditya724]

Problem

The events page at events.tsx:146-197 has status and repo filters, but no time range selector. The dashboard shows a "last 24h" stat, but there is no way to actually filter the events list by time period.

Operators investigating an incident need to quickly narrow down events to a specific time window (e.g., "last hour", "last 6 hours", "today", or a custom date range).

Affected File

• apps/server/src/client/pages/events.tsx:146-197 — filter bar area

Expected Fix

1. Add a time range filter alongside the existing status and repo filters
2. Preset options: Last hour, Last 6 hours, Last 24 hours, Last 7 days, All time
3. Optionally add a custom date range picker for precise windows
4. Sync the selected time range to URL search params (e.g., ?timeRange=24h or ?from=...&to=...)
5. The API may need to accept from/to query parameters — check if the backend already supports this, or add the filtering server-side

Design Guidance

• Use a <Select> dropdown with preset options (consistent with the page-size selector pattern)
• Place it in the filter bar after the repo search
• The custom date range (if implemented) could use a popover with two date inputs
• Keep the text-xs sizing consistent with other filter controls

Impact

Low — The current all-time flat list works for small event volumes, but becomes unwieldy as events accumulate. Time filtering is a standard expectation for any event/log viewer.

[jared-outpost]

opened #214 with a time-range filter for the events page — presets (last hour / 6h / 24h / 7 days / all time) synced to ?timeRange=, plus server-side from/to filtering on the events API. it's a draft while CI runs; ready for review.