Fix email links navigating the reader and opening repeated tabs

[bcbetterninja]

Clicking an email link could navigate the embedded reader and open additional browser tabs as the destination redirected. Keep the email visible and launch the external browser once per click, including links requesting a new window and cases where the OS launcher fails or returns no process handle. Apply the same shared handling to the notes reader.

Avalonia WebView 12.1.0’s GTK adapter returns a handled policy result without explicitly rejecting the WebKit navigation. Add a lifecycle-managed GTK policy handler that calls webkit_policy_decision_ignore and only launches external links for actual user clicks. Redirects and script navigation cannot launch more tabs; local documents and image loading remain supported.

Validation:

• Solution and UI preview builds passed with zero warnings/errors.
• All 553 tests passed, including cancellation independent of browser launch success.
• Real Linux WebKit regression passed using synthetic mail and a loopback redirect server: one launch per click, unchanged email content, zero redirect requests, new-window links, launcher failure, script navigation, and view reattachment.
• Added the Linux regression check to CI. No private email content or screenshots are included.

[coderabbitai]

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Plan: Advanced

Run ID: 3243f9af-44e9-4357-98a3-e22ec6139080

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