feat(sidebar): properly implement sidebar Proxy for Nextcloud 33+

[susnux]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.72%. Comparing base (0301bba) to head (4d0a940).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/sidebar/SidebarAction.ts	0.00%	22 Missing ⚠️
lib/sidebar/Sidebar.ts	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1447      +/-   ##
==========================================
- Coverage   89.64%   86.72%   -2.93%     
==========================================
  Files          26       27       +1     
  Lines         705      723      +18     
  Branches      189      196       +7     
==========================================
- Hits          632      627       -5     
- Misses         59       82      +23     
  Partials       14       14              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.