Persist window size and last camera preset (#69, #70)

[petegordon]

Fixes #69 and #70.

#69 — Save the last window size (default 720×540)

apps/overlay/electron/main.js

• Added a small persistent store (window-state.json under Electron's userData), keyed per mode (single / multi) so the two layouts don't clobber each other.
• The single-controller window now defaults to 720×540 (was 600×400) — a clean capture size, so you can frame it once for OBS and just hit "start recording" next time.
• Size is restored on launch, saved on resize (debounced 400 ms) and again on close as a backstop.
• A sanitizeSize guard rejects corrupt / out-of-range values and falls back to the mode's default.

#70 — Save the last camera position selected

apps/overlay/src/js/app.js

• The selected preset is persisted to localStorage (overlay:cameraPreset) on every pick, validated against the known list (front/back/left/right/player/top), and restored on launch.
• The saved view is re-applied to the 3D overlay once it finishes initializing — so if you like Top, the overlay reopens to Top instead of always resetting to Player.

Testing

• npm test — all 85 controller-core tests pass.
• node --check passes on both modified files.
• Note: these are runtime-behavior changes in the Electron GUI app, which can't be launched in the headless CI environment, so they were verified by syntax check + existing unit tests rather than an end-to-end GUI run.

Scope note

#70 is scoped to the main overlay — the multi-player demo (multi-app.js) has no camera presets, so nothing changed there.

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https://claude.ai/code/session_017NiS2a4jZ877XgftkH1Dd1

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