fix: build speed, observer AI details, round tracker empty state

- Disable typedRoutes and skip TS in build (run tsc separately) — build
  drops from ~9min to ~36s
- Expand optimizePackageImports for sonner, date-fns, recharts, motion, zod
- Docker: mount .next/cache as build cache for faster rebuilds
- Observer filtering panel: fix AI reasoning extraction (nested under rule ID)
  and show confidence, quality score, spam risk, override reason
- Round User Tracker: show empty state message instead of disappearing when
  selected round has no passed projects yet

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

docker/Dockerfile

@@ -23,9 +23,9 @@ COPY . .
 # Generate Prisma client
 RUN npx prisma generate
 
-# Build Next.js
+# Build Next.js — mount .next/cache as a Docker build cache for faster rebuilds
 ENV NEXT_TELEMETRY_DISABLED=1
-RUN npm run build
+RUN --mount=type=cache,target=/app/.next/cache npm run build
 
 # Production image, copy all the files and run next
 FROM base AS runner