Custom Viz - Realtime Clock

Dashboard Studio has no built-in clock, yet operations walls, NOC status boards, world-clock panels and "as of now" headers all want a live, ticking time display. **Realtime Clock** adds two purpose-built custom visualizations that render the current time entirely client-side at 60fps — no streaming data, no scheduled searches, no backend. **Analog Clock** — a smooth analog face with sweeping hands, tick marks, an optional digital readout and day/date line, and a configurable phosphor glow. Hand, second-hand and tick colours are all configurable. **Digital Clock** — a seven-segment LCD-style display with a blinking colon, 12/24-hour modes, optional seconds, a date line, ghost (unlit) segments for an authentic LCD look, and a phosphor glow. Both support **local time, UTC, or any IANA timezone** (e.g. `Europe/London`, `America/New_York`, `Asia/Tokyo`), so a single dashboard can show a row of world clocks. Because the time is computed in the browser, the clocks stay accurate to the second regardless of search refresh intervals. Built as standard `studio_visualization` custom viz, themable to light/dark, and dependency-free.