CI/CD Group Analytics: Add sub-group, date range, and default branch filters
## Summary Add the top-of-page filter bar to the CI/CD Group Analytics dashboard. This is gated behind the `ci_group_analytics` feature flag. ## Filters to implement 1. **Sub-group filter** — allows users to select: - No filter (Show all projects) - Direct projects in the group only - One or more specific subgroups 2. **Date range filter** — allows users to select the time range: - Last 24 hours - Last week - Last 30 days 3. **Default branch checkbox** — filters out pipelines not on the default branch ## Acceptance Criteria - All three filters are rendered at the top of the dashboard page - Selecting filter values updates the dashboard state (even if panels are not yet implemented) - Filters are gated behind the `ci_group_analytics` feature flag
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