fix: video fills available space + correct WASM path resolution

- Remove fixed aspect-ratio and max-height from video panel so it
  fills the available viewport space without scrolling
- Grid uses 1fr row for content area, overflow:hidden on main grid
- Fix WASM path: resolve relative to JS module file using import.meta.url
  instead of hardcoded ./pkg/ which resolved incorrectly on gh-pages
- Responsive: mobile still gets aspect-ratio constraint

Co-Authored-By: claude-flow <ruv@ruv.net>

ui/pose-fusion/css/style.css

@@ -129,10 +129,11 @@ body {
 .main-grid {
   display: grid;
   grid-template-columns: 1fr 360px;
-  grid-template-rows: auto auto;
+  grid-template-rows: 1fr auto;
   gap: 16px;
   padding: 16px 24px;
-  max-height: calc(100vh - 72px);
+  height: calc(100vh - 72px);
+  overflow: hidden;
 }
 
 /* === Video Panel === */
@@ -142,8 +143,7 @@ body {
   border-radius: var(--radius);
   border: 1px solid var(--bg-panel-border);
   overflow: hidden;
-  aspect-ratio: 4/3;
-  max-height: 60vh;
+  min-height: 0;
 }
 
 .video-panel video {
@@ -204,7 +204,7 @@ body {
   flex-direction: column;
   gap: 12px;
   overflow-y: auto;
-  max-height: calc(100vh - 88px);
+  min-height: 0;
 }
 
 .panel {
@@ -397,7 +397,9 @@ body {
 @media (max-width: 900px) {
   .main-grid {
     grid-template-columns: 1fr;
+    height: auto;
+    overflow: auto;
   }
-  .video-panel { aspect-ratio: 16/9; max-height: 40vh; }
-  .side-panels { max-height: none; }
+  .video-panel { aspect-ratio: 16/9; max-height: 50vh; }
+  .side-panels { max-height: none; overflow: visible; }
 }

ui/pose-fusion/js/main.js

@@ -111,8 +111,10 @@ function init() {
   });
 
   // Try to load WASM embedders (non-blocking)
-  visualCnn.tryLoadWasm('./pkg/ruvector_cnn_wasm');
-  csiCnn.tryLoadWasm('./pkg/ruvector_cnn_wasm');
+  // Resolve relative to this JS module file (in pose-fusion/js/) → ../pkg/
+  const wasmBase = new URL('../pkg/ruvector_cnn_wasm', import.meta.url).href;
+  visualCnn.tryLoadWasm(wasmBase);
+  csiCnn.tryLoadWasm(wasmBase);
 
   // Auto-start camera for video/dual modes
   updateModeUI();