* fix: allow native context menu on links in chat messages
The desktop app was blocking the context menu on all elements except
specific allowlisted ones (terminal, input, textarea, etc.). This
prevented users from right-clicking on HTTP links in chat messages
to access the 'Open Link' option.
Added 'a' (anchor) tag to the allowlist to restore native context
menu functionality for links.
Fixes#708
* fix: use tauri.shell.open for external links in desktop app
- Add global window.open override to init_script that routes HTTP/HTTPS
URLs through tauri.shell.open() instead of window.open()
- Add openExternalUrl utility that prefers tauri.shell.open with window.open fallback
- Add openExternalUrl to MarkdownRenderer for link safety.onLinkCheck
- Replace window.open with openExternalUrl in ProvidersPage for OAuth URLs
Fixes#708
* fix: unify external link opening across desktop and UI
Added a shared URL opener that only allows http/https links.
Replaced duplicated Tauri/window link-open logic in key UI sections.
Removed fragile desktop window.open override and markdown external-link modal behavior.
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Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>
