Implements the five §3.x spec-completion items flagged in PAP-10735:
1. Runs row subtitle (§3.6): rebuild RunsSection on <EntityRow> with a
subtitle showing inline variable values for successful runs and the
failure reason for failed runs; de-dupe the redundant trigger label
when label === kind (new ui/src/lib/routine-run-display.ts).
2. Runs filter chips (§3.6): Source/Status/Date selects + <FilterBar>
active pills + Clear, with a filtered-empty state.
3. Delivery next-5-fires preview (§3.5): new tz-aware ui/src/lib/cron-fires.ts
plus a pure previewFirePolicies() that annotates each fire with how the
chosen concurrency policy treats it (queued/coalesced/skipped).
4. Secrets (§3.4): extend EnvVarEditor with recentlyUsedSecrets quick-bind
chips and replace the native <select>s with shadcn <Select> for parity.
5. Triggers (§3.2): convert the always-open add form into a + New trigger
expand-on-click drawer.
Tests: new cron-fires + routine-run-display unit suites (30 cases);
existing routine/EnvVarEditor-consumer tests stay green; tsc clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
