fix: open bug reports from desktop app

[harshmathurx]

Summary

Fixes the Mac app's Report a bug action.

Why

In the desktop app, the existing window.open path did not reliably open the GitHub issue form. A bug-report entry point should work from the place where the bug happens.

Changes

• Added a Tauri command for opening trusted GitHub URLs in the system browser.
• Routed the desktop bug-report action through that command.
• Kept the browser fallback for web builds.
• Added a regression test for the Tauri path.

Testing

• pnpm exec vitest run tests/feedback/bugReport.test.ts
• cargo check --manifest-path src-tauri/Cargo.toml
• pnpm run typecheck
• pnpm run lint
• pnpm exec vitest run
• pnpm run build
• GitHub CI passed.

Release note

Fixed Report a bug in the Mac app so it opens a prefilled GitHub issue in the system browser.