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## Summary Stabilize the Studio preview/runtime path so timeline data, preview rendering, and thumbnails stay in sync. This PR includes: - preview hot-refresh without remounting the iframe - runtime duration/timeline fixes so Studio stops drifting from playback state - thumbnail and selector-based preview fixes - local Studio runtime serving and player-resolution fixes so dev/CI do not depend on prebuilt player artifacts - tests around preview identity and thumbnail/runtime behavior ## Why This PR Exists This is the foundation layer for timeline editing. Without it, the editor was prone to: - iframe remount flashes after saves - duration mismatches between preview and timeline - stale or incorrect thumbnails - CI/test failures when `@hyperframes/player` artifacts were not prebuilt ## Verification - `bun run --filter @hyperframes/studio test` - `bun run --filter @hyperframes/studio typecheck` - `bun run --filter @hyperframes/core typecheck` - `bunx oxlint packages/cli/src/server/studioServer.ts packages/core/src/runtime/timeline.ts packages/core/src/runtime/timeline.test.ts packages/core/src/studio-api/routes/thumbnail.ts packages/core/src/studio-api/routes/thumbnail.test.ts packages/core/src/studio-api/types.ts packages/studio/src/components/nle/NLELayout.tsx packages/studio/src/components/nle/NLEPreview.tsx packages/studio/src/components/nle/NLEPreview.test.ts packages/studio/src/player/components/CompositionThumbnail.tsx packages/studio/src/player/components/Player.tsx packages/studio/src/player/hooks/useTimelinePlayer.ts packages/studio/src/player/store/playerStore.ts packages/studio/vite.config.ts` - `bunx oxfmt --check packages/cli/src/server/studioServer.ts packages/core/src/runtime/timeline.ts packages/core/src/runtime/timeline.test.ts packages/core/src/studio-api/routes/thumbnail.ts packages/core/src/studio-api/routes/thumbnail.test.ts packages/core/src/studio-api/types.ts packages/studio/src/components/nle/NLELayout.tsx packages/studio/src/components/nle/NLEPreview.tsx packages/studio/src/components/nle/NLEPreview.test.ts packages/studio/src/player/components/CompositionThumbnail.tsx packages/studio/src/player/components/Player.tsx packages/studio/src/player/hooks/useTimelinePlayer.ts packages/studio/src/player/store/playerStore.ts packages/studio/vite.config.ts` ## Stack - base of stack - followed by `feat: add studio timeline editing` - followed by `fix: smooth scrubber end seeking`