servoshell: add support for tabbed browsing #31545
Draft
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This patch adds support for tabbed browsing in servoshell’s minibrowser, like #30785 but rebased onto #31417 and simplified to avoid current multiview and egui limitations.
For now, only one webview will be focused and shown at a time. To close a tab, click the ❌︎ in the tab bar, or middle-click the tab itself. When closing a tab that is currently focused, we switch to the next most recently focused tab.
./mach build -d
does not report any errors./mach test-tidy
does not report any errors