Reduce the settings page container height calculation from
calc(100vh - 100px) to calc(100vh - 70px) so the content fits the
visible viewport when the header height is 70px. This prevents
unnecessary vertical overflow and avoids extra whitespace at the
bottom of the settings page.
Add support for displaying local remote-control URLs and QR code in the
Settings UI, including styles for URL list, row layout, monospaced links,
and a QR container. Expose a new global API signature getLocalIpAddresses
for retrieving local IPs.
Fix several UI issues:
- Correct typo in header method name (opedAddPlaylistDialog -> openAddPlaylistDialog).
- Fix malformed GitHub URL and collapse img tag formatting.
- Reformat imports and viewChild usage for readability.
Change local development backend URL to localhost:3000 in the local
environment to point to the running local API during development.
These changes improve developer ergonomics (local backend), add a remote
control discovery UX for users on the same network, and tidy up header
bugs and formatting.
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