fix(guided): preserve setup after palette creation

[Flow-Fly]

Summary

• keep the Guided Drawing Advanced disclosure open when returning from inline palette creation
• show the selected source filename from the existing in-memory File after the native input remounts
• preserve setup controls, previews, palette selection, status, and focus across both Save and Cancel returns

Linked task issues

• Guided Drawing — preserve setup state after inline palette creation #429

Verification

• Focused dialog tests (26 passed)
• npx tsc --noEmit
• npm run lint (0 errors; 5 inherited warnings)
• npm run test:run (116 files; 744 tests)
• npm run build (existing chunk and dynamic-import warnings only)
• npm run fallow:audit -- --changed-since 11e020292bfa7ae397c6d68700c21294ed9d930a
• Strict no-cache exact-base Fallow with --fail-on-issues
• git diff --check
• Residue, secrets, dependency-lock, large-file, and binary sweeps
• GitHub CI run 30570035003 (checks and server-container)
• Complete-diff simplification review (no change warranted)
• Interactive browser playtest: not available in this worker environment; component interactions cover Save and Cancel return paths, filename visibility, disclosure state, setup controls, previews, palette selection, status, and focus.

Boundaries

• dialog-local state only
• no FileList synthesis or protected file-input value assignment
• no saved-palette cache synchronization from Custom palettes — synchronize saved-palette caches across open project contexts #428
• no schema, project mutation, dependency, or analytics changes

All non-playtest gates are complete. Ready for the automatic exact-head review.

[coderabbitai]

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