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Add a tab bar to the HTTP frontend card. All existing controls stay in the Main tab. A new About tab shows server version, callsign, rig info, client version, and connected client count, updated live via SSE. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>