style: increase background opacity on Switch, ConditionalSwitch, and Router nodes

Changed from /50 to /80 so the nodes are more visually prominent on the canvas.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/nodes/ConditionalSwitchNode.tsx

@@ -229,7 +229,7 @@ export const ConditionalSwitchNode = memo(({ id, data, selected }: NodeProps<Wor
       selected={selected}
       minWidth={260}
       minHeight={minHeight}
-      className="bg-teal-950/50 border-teal-600"
+      className="bg-teal-950/80 border-teal-600"
     >
       {/* Input handle (left) - text only, aligned with header */}
       <Handle

src/components/nodes/RouterNode.tsx

@@ -79,7 +79,7 @@ export const RouterNode = memo(({ id, data, selected }: NodeProps<WorkflowNode>)
       selected={selected}
       minWidth={200}
       minHeight={minHeight}
-      className="bg-neutral-800/50 border-neutral-600"
+      className="bg-neutral-800/80 border-neutral-600"
     >
       {/* Input handles (left) */}
       {activeInputTypes.map((type, index) => (

src/components/nodes/SwitchNode.tsx

@@ -122,7 +122,7 @@ export const SwitchNode = memo(({ id, data, selected }: NodeProps<WorkflowNode>)
       selected={selected}
       minWidth={220}
       minHeight={minHeight}
-      className="bg-violet-950/50 border-violet-600"
+      className="bg-violet-950/80 border-violet-600"
     >
       {/* Input handle (left) */}
       {nodeData.inputType ? (