* feat: support window.open() popup windows (#742)
Return a live WKWebView from createWebViewWith using WebKit's supplied
configuration, preserving popup browsing-context semantics (window.opener,
postMessage). This fixes OAuth/OIDC flows and any site relying on standard
popup patterns.
- Add BrowserPopupWindowController: NSPanel-based popup with self-retention,
KVO title/URL, read-only URL label, nested popup depth limit (3),
insecure-HTTP prompt parity, auth challenge parity, download delegate
- Classifier: scripted requests (window.open) create popups; user-initiated
actions (Cmd+click, middle-click, context menu) open tabs
- Retarget context menu "Open Link in New Tab" to bypass createWebViewWith,
wired in both main browser and popup web views
- Cmd+W fast path in AppDelegate for popup windows
- Opener panel owns popup lifecycle; close() tears down all child popups
* fix: Cmd+W closes only the popup, not the parent tab
Add BrowserPopupPanel (NSPanel subclass) that intercepts Cmd+W in
performKeyEquivalent before the swizzled cmux_performKeyEquivalent
can dispatch it to the main menu's "Close Tab" action.
Also refine the popup classifier to reuse browserNavigationShouldOpenInNewTab
for Cmd+click/middle-click detection, add download delegate wiring, and
wire onContextMenuOpenLinkInNewTab for popup web views.
* fix: tighten popup routing and window behavior
* test: cover oversized popup frame clamping
* test: cover plain link-activated popup routing
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Co-authored-by: Lawrence Chen <lawrencecchen@users.noreply.github.com>
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