* fix(app): cancel large FIG opens before tab cleanup
- Abort tab-local preparation before awaiting recovery persistence so closing a decoding tab terminates its FIG worker immediately
- Add explicit graph-event unsubscription and lazy FIG resource release for disposed editor stores
- Keep staging-editor disposal separate from live graph resource ownership
- Let same-origin document fetches bypass all cross-origin font response limits
* refactor(fig): isolate worker sessions per document
- Give each lazy FIG document a dedicated MessageChannel and retained worker session
- Route manifest and page population traffic through the session port instead of global worker handlers
- Close the port and worker explicitly on cancellation or tab disposal
- Preserve current lazy source transfer and export fidelity until raw NodeChange patch export is implemented
* perf(fig): preserve unchanged archives in worker sessions
- Keep a second transferable copy of the original FIG archive inside the document worker session instead of main-thread memory
- Track whether user graph mutations invalidate exact archive reuse
- Return unchanged documents byte-for-byte through the session without full-page materialization or recompression
- Release archive request ownership with the page population worker and editor graph resources
* fix(fig): choose the first visible imported page
- Ignore internal-only canvases when selecting the initial active page\n- Keep internal component pages available for lazy instance population
* fix(fig): retain original archives across fallbacks
- Keep session-owned workers alive when population is oversized\n- Register the input archive when worker graph transfer falls back to the main thread\n- Preserve byte-identical unchanged saves without restoring lossy materialization
* fix(fig): harden worker session ownership
- Route concurrent archive replies through persistent request resolvers and reject stale in-flight archives after edits\n- Retain disposal-only handles for oversized sessions and guard Worker construction\n- Reuse the shared FIG import options contract and cover session disposal and invalidation
* test(fig): isolate Worker availability mutation
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