Add Sentry source maps and release tracking

- @sentry/vite-plugin uploads source maps during Docker build
- Release tagged with git SHA (SENTRY_RELEASE) on both client and server
- Environment set to production/development for filtering
- CD passes SENTRY_AUTH_TOKEN + SENTRY_RELEASE as Docker build args
- docker-compose passes SENTRY_RELEASE to runtime containers

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/planner/Dockerfile

@@ -14,6 +14,8 @@ COPY packages/db/package.json packages/db/
 RUN pnpm install --frozen-lockfile
 
 FROM base AS build
+ARG SENTRY_AUTH_TOKEN
+ARG SENTRY_RELEASE
 COPY --from=deps /app/ ./
 COPY . .
 RUN pnpm --filter @trails-cool/planner build