video.svelte + double_video.svelte — Video Components

video.svelte 
 TODO: still being developed, going to change 
 The basic single-camera display component. Accepts a camera object from state.svelte.js and renders it as an <img> tag pointing at the MJPEG stream URL. Supports two optional modes passed as the mode prop: 
 measure mode — enables pixel-clicking for stereo measurement. The operator clicks two points across two camera feeds; the component calls invoke("request_measurement") with the pixel coordinates from both cameras and returns the result via an onmeasurement callback. pick mode — enables a pick-up interaction for probe/rock collection. The pick() function is a stub ready for the actual rover arm command to be wired in. 
 When no mode is set the component is a plain passive video display. 
 double_video.svelte 
 Displays two camera feeds simultaneously with a picture-in-picture layout. The primary feed fills the frame; the secondary feed appears as a smaller overlay in the bottom-right corner. Clicking the overlay swaps the two feeds, making the secondary feed the primary and vice versa. 
 Both feeds show a ⚠ SIGNAL LOST overlay banner when their stale flag is true (set by the camera health listener in state.svelte.js ). The secondary feed shows a smaller version of the same warning. 
 Props: camera1 , camera2 — camera objects from state.svelte.js .