Animate and polish the website, iPad app and Windows window

[whoisaldo]

What changed

Website (docs/)

• The hero rises in word by word on load; the showcase window and iPad slide into place, then the iPad floats with a beacon ring.
• Feature, step, requirement and FAQ groups reveal one item after another; cards lift with a pointer-following spotlight.
• The nav turns solid on scroll and highlights the section in view; the release timeline draws its connector; the FAQ animates open where interpolate-size is supported.
• Nothing is hidden without JavaScript (html.no-js), and prefers-reduced-motion shows everything at once.
• The showcase uses a fresh render of the Windows window.

iPad

• The connect screen staggers in on launch and the stream picture fades in; the HUD re-shows whenever the link changes, such as a cable taking over.
• Connecting and reconnecting show pulse rings; the live dot breathes; HUD numbers roll with contentTransition(.numericText()).
• Buttons and list rows answer presses with springs; a wrong pairing code shakes the field.
• Continuous effects stop under Reduce Motion. Accessibility identifiers and labels are unchanged.

Windows

• Pages and notices fade and settle in (widgets::appear); the sidebar marks the open page with a lime bar that slides to the one clicked.
• Hover states, the segmented pill and the slider knob interpolate instead of switching.
• The window still repaints only while something animates, so the encoder keeps the GPU. Automation names are unchanged.

docs/design.md gains a Motion section. A Watch section under the hero embeds the twenty-second launch film (poster, one play button, native controls once it runs, no autoplay). The contact address change lives in #54, not here.

Verification

• Site: headless Chrome captures at 1440, 1024 and 390 px (no horizontal overflow), mid-animation frames, hover, and the reduced-motion variant.
• iPad: Debug build for the iPad simulator, every EM_UI_PREVIEW state screenshotted, launch and connecting recordings inspected, ConnectScreenTests pass (3/3).
• Windows crate on macOS: cargo build, cargo clippy --all-targets -D warnings, cargo test --lib gui, and gui_snapshots pass. The six references were updated; the only pixel difference is the new sidebar bar.