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bddac127bc
The "Primary chains only / All" filter dropdown that was punted from
Phase 2.3 (ed2ddb51d) so the user could review the bigger UI surface.
Implementation:
- new selectedTier state, default "primary"
- filteredQuestions filter: when "primary", drop questions whose
chain memberships are *all* secondary (questions not in any chain
pass through unchanged — they're tier-irrelevant).
- Tier FilterSelect dropdown next to the existing Level filter.
Default behaviour intentionally hides secondary-only questions —
matches the rest of the Phase 2 surfaces (practice prefers primary,
ChainBadge shows "alt path" pill on secondary, explore picks primary
chains for the related panel). Users opt into seeing the lenient-pass
questions by switching to "All chains".
Tests: new playwright case test8_explore_tier_filter:
- tier filter dropdown rendered
- switching to "All chains" keeps page interactive (no crash on
re-filter)
Smoke suite: 19/19 pass.