Dashboard & UI Polish
• Dual TX/RX Telemetry Pips: Replaced the circular CSS spinner in the footer with dual hardware telemetry activity pips (#act-tx and #act-rx).
- Sits quietly as twin 4px pips at faint 15% opacity (
var(--w15)) beside the clock with zero layout or typographic shift. - Left pip flashes bright white (
var(--w100)) on command dispatch (TX). - Right pip flashes bright white on TV response acknowledgement (RX), confirming socket round-trip before fading smoothly back to idle.