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Clicking WhatsApp left Claude on screen while the address bar said
web.whatsapp.com, and the app felt sluggish. Same cause for both.
`.pane webview` declared `visibility: visible`. CSS visibility inherits, and
an explicit `visible` on a child overrides a hidden ancestor — so every
webview un-hid itself inside its hidden pane. All services rendered at once,
stacked absolutely, and you saw whichever painted last. Chromium also never
throttled them, since none were occluded.
Measured before: four panes, four webviews `visible`, all full size.
After: exactly one visible, three hidden, CPU 0% across the board.
Also removes the global `webview { visibility: hidden }` / `webview.active`
rules. They predate the pane wrapper and key off a class nothing sets any
more; with the child rule gone they were hiding the active service too.
Verified through single view, split, spotlight, back to single, and clicking
each service in turn.
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Fixes wrong service being shown and the resulting slowness: every webview was rendering at once because of an inherited CSS visibility override.