Add Zoom on Card

Use Left Alt Key (for now)
Closes #13

app.vue

@@ -26,6 +26,41 @@ onMounted(async () => {
   heron_cookie_login(heron_session.value)
 })
 
+function keyDownHandler(e: KeyboardEvent) {
+  if (e.repeat) { return }
+  console.log(e.code)
+  if (e.code != "AltLeft") { return }
+  goStore.zoomKeyPressed = true
+  e.preventDefault()
+  return false
+}
+
+function keyUpHandler(e: KeyboardEvent) {
+  if (e.repeat) { return }
+  if (e.code != "AltLeft") { return }
+  goStore.zoomKeyPressed = false
+  e.preventDefault()
+  return false
+}
+
+function follow_mouse(e: MouseEvent) {
+  goStore.clientMouseX = e.clientX
+  goStore.clientMouseY = e.clientY
+}
+
+onMounted(() => {
+  window.addEventListener("keydown", (keyDownHandler))
+  window.addEventListener("keyup", keyUpHandler)
+  document.addEventListener("mousemove", follow_mouse)
+})
+
+onUnmounted(() => {
+  window.removeEventListener("keydown", (keyDownHandler))
+  window.removeEventListener("keyup", keyUpHandler)
+  document.removeEventListener("mousemove", follow_mouse)
+})
+
+onDeactivated
 </script>
 <template>
   <div class="root_dom_div">