feat(desktop): persist window bounds across launches

[jiezhengj]

Splits the desktop-window work out of #80 for focused review (3/4).

Summary

• use a roomier 1280 x 820 first-launch size
• persist normal window position, dimensions, and maximized state
• clamp restored bounds to the closest currently available display
• stop upload/editor project transitions from overriding user-selected dimensions
• preserve the existing two-step native Close behavior without using project mode for resizing

Validation

• npx tsc --noEmit
• npm run typecheck:electron
• npm run lint
• npm run build:electron
• manually verified that 1180 x 760 restores exactly after restart and remains unchanged after importing media

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