Remove companyURL and align branding docs/config with explicit Support/Privacy/About URLs

[Copilot]

companyURL had become redundant after introducing explicit branding links for support, privacy, and about. This PR removes companyURL across runtime config surfaces and updates branding documentation/examples to reflect the current model.

• Runtime branding model cleanup

  • Removed companyURL from branding defaults and managed schema:
    • config/branding.json
    • config/managed_schema.json
    • scripts/modules/config-manager.js
  • Removed legacy privacy fallback derived from companyURL; privacy now comes from explicit privacyPolicyUrl or default branding config.

• Options + popup behavior

  • Removed Company URL input and persistence wiring from options:
    • options/options.html
    • options/options.js
  • Removed popup company-link handling (companyLink + "company" footer route); company branding remains visible as text:
    • popup/popup.html
    • popup/popup.js

• Enterprise policy surface updates

  • Removed companyURL from policy artifacts/examples (Windows scripts/registry, ADMX/ADML, Firefox/macOS/Linux policy JSON):
    • enterprise/Deploy-Windows-Chrome-and-Edge.ps1
    • enterprise/Remove-Windows-Chrome-and-Edge.ps1
    • enterprise/Check-Extension-Policy.reg
    • enterprise/admx/Check-Extension.admx
    • enterprise/admx/en-US/Check-Extension.adml
    • enterprise/firefox/policies.json
    • enterprise/macos-linux/chrome-managed-policy.json
    • enterprise/macos-linux/edge-managed-policy.json
    • enterprise/Test-Extension-Policy.ps1

• Documentation alignment

  • Updated branding docs to document current link fields (supportUrl, privacyPolicyUrl, aboutUrl) and kept naming consistent:
    • docs/settings/branding.md

• Focused test expectation update

  • Updated config persistence test to remove companyURL usage and assert fallback URLs from default branding config:
    • tests/config-persistence.test.js

// config-manager.js
if (!finalBranding.supportUrl && finalBranding.supportEmail) {
  finalBranding.supportUrl = `mailto:${finalBranding.supportEmail}`;
}
// removed: privacy fallback from companyURL

https://github.com/user-attachments/assets/7aa7e466-66fb-4eee-8a85-0799431940e6

Original prompt

Branding options manually in the GUI and the Support and Privacy buttons still don't do anything. The About button works fine. Please check they are wired correctly and also make sure they work in the enterprise deployment method as well

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