Exercise the Linux desktop release launch in CI

[timohueser]

Desktop CI now launches the existing Linux release binary and its embedded custom-protocol frontend under Xvfb with an isolated D-Bus session. The real region picker searches for and adds Switzerland from a loopback catalog through Rust IPC, checks the resolved 994 B part, and closes the application. The dedicated affected end-to-end job is part of the aggregate gate.

The harness uses tauri-driver 2.0.6, Selenium 4.35.0 and a native WebKit driver matched exactly to its runtime. It keeps bounded state waits, driver/application logs, catalog requests, HTML, a ready screenshot, and failure screenshots. No production test hook or development server is used.

Independent adversarial review cleared the implementation and each later delta through 909861bfc9a278c207cb2034004f0354b0ff5550. CI run 34789369813 passed every required job and the aggregate on this exact head. Root and implementer inspected desktop-launch-linux-1: tauri://localhost, Switzerland selected, 994 B resolved, all six native catalog requests returned 200, and application_exited: true. The screenshot shows the real UI; the application log has no panic. Merged as 941596a802df4fe65e5e65538e3d2868d0f62e75.

Validation:

• Whole repository Python suite: 173 tests passed with the maintained XML reporter after integration.
• ./tools/obc suites check, ./tools/obc suites validate-filters, and ./tools/obc test affected --base origin/develop --dry-run passed.
• Harness syntax and the actual TypeScript catalog/region fixture parsers passed.
• Workspace and all three standalone Cargo roots were formatted.

No local desktop release build, Linux emulation, physical test, resource build, UI snapshot sweep or full CI mirror was run. No public documentation changed; the desktop README documents reproduction and evidence. Initial CI startup failures established the need for an isolated D-Bus session; their artifacts remain linked in #1727.

Closes #1727. #994 and #1448 remain open. Physical USB detection/upload, Windows launch, macOS automation, installers, signing and distribution remain outside this change.

[coderabbitai]

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