* dashboard: pan canvas via middle-drag and horizontal scroll over browser/chat
- Middle-mouse drag inside a browser webview is forwarded as canvas pan
(previously eaten silently by the guest compositor).
- Horizontal-dominant wheel inside a browser webview pans the canvas
when no ancestor in the guest page can absorb horizontal scroll;
otherwise the page handles it.
- Horizontal-dominant wheel over a chat panel pans the canvas (chat has
no horizontal scroller). Vertical scroll is unchanged.
Plain vertical scroll and ctrl/meta+wheel zoom over a browser stay with
chromium's defaults.
* browser: drop in-guest zoom locks so pinch and cmd+wheel zoom the page
setVisualZoomLevelLimits(1, 1) blocked pinch-to-zoom inside the webview, and
setZoomFactor(1) on every dom-ready reset any user page zoom. Both were added
back when canvas zoom was supposed to take over for ctrl+wheel; with that
reverted, chromium's native zoom handlers should run unimpeded.
* [aidan] fix: prev. commit fix. restore ctrl+wheel canvas zoom over webview cards
* [aidan] ui/ux: app navigation
* [aidan] ui/ux: gate webview preload forwarding on app interactive mode
When a view card is "interactive" (user clicked into the app), the preload stops forwarding ctrl+wheel, middle-mouse-drag, and horizontal-scroll-pan gestures so the embedded app gets every event. A mousedown notifier reports in-guest clicks to the host so it can flip the card into interactive mode without intercepting the click itself.