Add condition badges for boss Pokemon mechanics

Show colored pill badges (Mega, G-Max, D-Max, Tera) on boss Pokemon
in BossDefeatModal and BossTeamPreview. Starter-dependent condition
labels are ignored. Follows EncounterMethodBadge pattern.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans/nuzlocke-tracker-l12w--add-condition-badges-for-boss-pokemon-mechanics.md

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+---
+# nuzlocke-tracker-l12w
+title: Add condition badges for boss Pokemon mechanics
+status: in-progress
+type: feature
+priority: normal
+created_at: 2026-02-16T20:11:02Z
+updated_at: 2026-02-16T20:11:52Z
+---
+
+Add visible badges on boss Pokemon that have mechanic-related conditions (Mega Evolution, Gigantamax, Dynamax, Terastallize). Create a ConditionBadge component following the EncounterMethodBadge pattern and integrate it into BossDefeatModal and BossTeamPreview.
+
+## Checklist
+
+- [x] Create ConditionBadge component in frontend/src/components/ConditionBadge.tsx
+- [x] Add ConditionBadge to BossDefeatModal.tsx boss team preview
+- [x] Add ConditionBadge to RunEncounters.tsx BossTeamPreview
+- [x] Verify with tsc and oxlint