Fix: restore techCtx and openTechCtx lost during map extraction

These were accidentally deleted when removing ~576 lines of inline map code.
Caused ReferenceError preventing the app from loading data.

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

src/pages/DispatchV2Page.vue

@@ -1110,6 +1110,13 @@ async function autoDistribute () {
   invalidateRoutes()
 }
 
+// ─── Tech context menu (was deleted during map extraction) ────────────────────
+const techCtx = ref(null)
+function openTechCtx (e, tech) {
+  e.preventDefault(); e.stopPropagation()
+  techCtx.value = { x: Math.min(e.clientX, window.innerWidth - 220), y: Math.min(e.clientY, window.innerHeight - 120), tech }
+}
+
 // ─── Optimize route for a single tech ─────────────────────────────────────────
 async function optimizeRoute () {
   if (!techCtx.value) return