[WIP] feat(studio): auto-detect multiple projects in parent directories

[miguel-heygen]

Summary

• Auto-discovers sub-projects when hyperframes dev points at a parent directory containing multiple projects (each with their own index.html)
• Adds project selector dropdown in the Studio header when multiple projects are found
• Per-project render storage — each project stores renders in its own renders/ subdirectory
• Backward compatible — single-project directories work exactly as before

How it works

my-videos/
  project-a/
    index.html          ← detected as project
    compositions/
  project-b/
    index.html          ← detected as project
  shared-assets/
    logo.png            ← ignored (no index.html)

hyperframes dev my-videos/ → Studio shows both project-a and project-b in a dropdown selector.

Stacks on feat/studio-file-management.

Test plan

• hyperframes dev on a single project → works as before (no dropdown)
• hyperframes dev on a parent dir with 2+ projects → dropdown appears, switching works
• File tree, preview, lint, render all work per-project
• Renders stored in each project's own renders/ dir

[miguel-heygen]

• [WIP] feat(studio): auto-detect multiple projects in parent directories #148 👈 (View in Graphite)
• feat(studio): full IDE-like file management #147 : 1 other dependent PR (#155 )
• refactor(studio): code quality — 22 findings, dead code removal, App.tsx split #144
• feat(studio): timeline hidden by default with toggle in header + player #142
• feat(studio): redesign left panel — Code tab, Renders header, Lint bottom #141
• feat(studio): remove home page, auto-select project #145
• main

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