v0.5.48

## [0.5.48] -- Font picker, stale fixes, connection stream fixes

Added

• Font Family picker (public/index.html, public/app.js, public/css/app-fonts.css, public/fonts/) -- 24 self-hosted font options (System UI, Syne, Inter, IBM Plex Sans, JetBrains Mono, Fira Code, and 18 more) selectable in Settings > Appearance; stored in localStorage, applied instantly via --font-ui CSS variable. All fonts are served as self-hosted WOFF2 files with no CDN requests. Closes #73
• Font Size picker (public/index.html, public/app.js) -- six presets (Extra Small to Extra Large) in Settings > Appearance; stored in localStorage, applied by setting document.documentElement.style.fontSize

Changed

• Total Hits dashboard card removed (public/index.html, public/js/dashboard-grid.js, public/app.js) -- the dc-card-fwhits card (firewall total hits sparkline) has been removed from the dashboard; HTML, layout entry, CARD_ROOMS/CARD_LABELS entries, and firewall:update rendering code all deleted. Closes #69
• Top Talkers, WireGuard, and NetWatch table headers (public/index.html) -- removed gray thead background so headers blend with the dark card background

Fixed

• WireGuard dashboard card stale with stable peers (src/collectors/vpn.js, public/app.js, public/js/dashboard-grid.js) -- VPN payload was emitting pollMs: 5000, causing the browser to set the stale threshold to 25 s; with a 60 s heartbeat this meant the card went stale whenever peers were idle. Fixed by emitting pollMs: 0 to keep the fixed 90 s threshold. Added post-reconnect dashcard room re-sync so the heartbeat reaches the socket after a Socket.IO reconnect
• NetWatch dashboard card stale when state is unchanged (src/collectors/netwatch.js) -- added a 60 s heartbeat that re-emits lastPayload, keeping the browser's 90 s stale threshold from firing when no host status changes
• Connections card stale on stable networks (src/collectors/connections.js) -- force-emit guard reduced from 15 s to 10 s so the actual gap (10 s + pollMs) stays within the 23 s frontend stale threshold at any poll setting
• Connections stream killed after settings save (src/index.js) -- the stream-mode toggle loop called stop()+start() on all stream-mode collectors but start() does not re-open the stream (it waits for resume()); clients already connected so _idleResume never refired, leaving the stream dead. Fixed by adding else collector.resume() so the stream restarts when clients are present
• Stale timers not reset on socket reconnect (public/app.js) -- all stale countdown timers now reset on reconnect so cards do not show stale during the gap before collectors deliver their first post-reconnect payload

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