Phase 15: level-up strategy advisor + campaign insights

- Level-up build-route advisor (src/features/characters/sheet/LevelUpAdvisor.tsx +
  useLevelUpAdvisor): ~4 system-aware routes plus a custom one; choosing a route
  expands it into concrete next-level steps. AI when configured, deterministic
  fallback (src/lib/assistant/levelup.ts) otherwise. Embedded in the existing
  HP-only LevelUpModal, which stays primary.
- Level-up prompts/schemas added to prompts.ts (buildRoutes/buildSteps), each
  leading with the system constraint + class + next level.
- Campaign Insights section on the Assistant page renders deterministic themes,
  with an optional 'ask the assistant to expand' affordance when AI is on.

levelup + prompt unit tests (4 routes both systems, system vocabulary, custom
route); e2e for the deterministic route→steps flow and the insights section.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tsconfig.app.tsbuildinfo

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