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* fix: reduce autosave function invocation spam (25x anomaly) Root cause: useProjectScene() was mounted in BOTH editor/index.tsx AND project-dropdown.tsx, creating duplicate zustand subscriptions that each independently triggered saveProjectModel() server actions. Combined with a 2-second debounce and the fact that each server action also calls getSession() (another function invocation), active editing was generating ~120+ invocations/minute. Changes: - Remove duplicate useProjectScene() from project-dropdown.tsx - Increase autosave debounce from 2s to 10s - Skip auto-save on initial scene load from server (was saving the scene right back after loading it) - Add pending-save coalescing: changes during in-flight saves get batched into one follow-up save instead of queuing concurrently * fix: flush unsaved scene to cloud on page exit / unmount Adds two safety nets so the 10s debounce doesn't lose data: - beforeunload listener: fires saveProjectModel() when the user closes the tab or navigates away externally - cleanup flush on unmount: fires when navigating within the SPA (e.g. switching projects, going to settings) Both are fire-and-forget — if the browser kills the request, localStorage still has the data and will sync on next load. * style: fix biome import ordering in project-dropdown --------- Co-authored-by: Anton Pascal <anton-pascal@users.noreply.github.com>