fix: RDP canvas re-measures container on tab switch

When switching from SSH back to RDP, the canvas retained the resolution
from when the copilot panel was open — even after closing the panel.
The ResizeObserver doesn't fire while the tab is hidden (v-show/display),
so the container size change goes unnoticed.

Fix: On tab activation, double-rAF waits for layout, measures the
container via getBoundingClientRect, compares with canvas.width/height,
and sends rdp_resize if they differ. This ensures the RDP session
always matches the current available space.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/rdp/RdpView.vue

@@ -204,17 +204,44 @@ onBeforeUnmount(() => {
   if (resizeTimeout) { clearTimeout(resizeTimeout); resizeTimeout = null; }
 });
 
-// Focus canvas and force full frame refresh when switching to this tab
+// Focus canvas, re-check dimensions, and force full frame on tab switch
 watch(
   () => props.isActive,
   (active) => {
-    if (active && canvasRef.value) {
+    if (!active || !canvasRef.value) return;
-      // Force full frame fetch to repaint the canvas immediately
+
+    // Wait for layout to settle after tab becomes visible
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        const wrapper = canvasWrapper.value;
+        const canvas = canvasRef.value;
+        if (!wrapper || !canvas) return;
+
+        const { width: cw, height: ch } = wrapper.getBoundingClientRect();
+        const newW = Math.round(cw) & ~1;
+        const newH = Math.round(ch);
+
+        // If container size differs from canvas resolution, resize the RDP session
+        if (newW >= 200 && newH >= 200 && (newW !== canvas.width || newH !== canvas.height)) {
+          invoke("rdp_resize", {
+            sessionId: props.sessionId,
+            width: newW,
+            height: newH,
+          }).then(() => {
+            canvas.width = newW;
+            canvas.height = newH;
+            setTimeout(() => {
+              invoke("rdp_force_refresh", { sessionId: props.sessionId }).catch(() => {});
+            }, 200);
+          }).catch(() => {});
+        } else {
+          // Same size — just refresh the frame
           invoke("rdp_force_refresh", { sessionId: props.sessionId }).catch(() => {});
-      if (keyboardGrabbed.value) {
-        setTimeout(() => canvasRef.value?.focus(), 0);
-      }
         }
+
+        if (keyboardGrabbed.value) canvas.focus();
+      });
+    });
   },
 );
 </script>