Add custom Homebrew repository launch flow from Device Info

[Copilot]

This change adds a first-class way in Dev Manager to send a custom repository URL to Homebrew Channel, so users can add repos without typing URLs on TV. It directly addresses the friction behind custom repo loss/re-entry workflows.

• Info page: custom repo entry + action

  • Added a Custom Repository URL field and Add Repo action in the Homebrew Channel section (info.component.html).
  • The action is available when Homebrew Channel is detected on the selected device.

• Homebrew handoff integration

  • Added addCustomRepoToHomebrew() in InfoComponent to launch Homebrew Channel with launch params:
    • launchMode: "addRepository"
    • url: <user-provided-url>
  • This uses existing app launch plumbing (AppManagerService.launch) and Homebrew Channel’s native add-repository launch mode.

• Input validation + user feedback

  • URL is trimmed and validated via new URL(...).
  • Only http:// and https:// protocols are accepted.
  • Failure paths surface a user-facing dialog with a concrete error message; no-device-selected is handled explicitly.

• Focused unit coverage

  • Added info.component.spec.ts coverage for:
    • valid URL launch payload
    • invalid URL rejection
    • non-HTTP(S) protocol rejection
    • whitespace-trim behavior

await this.appManager.launch(device, APP_ID_HBCHANNEL, {
  launchMode: 'addRepository',
  url: parsed.toString(),
});