refactor: break up app.js into smaller modules

Split static/js/app.js (581 lines) into 5 focused modules:
- utils.js: global utilities store + legacy compat
- components.js: reusable Alpine.js components (copy, confirm, dismiss, time)
- app-detail.js: app detail page logic (status polling, logs)
- deployment.js: deployment card + deployments history page
- dashboard.js: dashboard relative time updates

Closes #128

static/js/dashboard.js

@@ -0,0 +1,21 @@
+/**
+ * upaas - Dashboard Page Component
+ *
+ * Periodically updates relative timestamps on the main dashboard.
+ */
+
+document.addEventListener("alpine:init", () => {
+  Alpine.data("dashboard", () => ({
+    init() {
+      // Update relative times every minute
+      setInterval(() => {
+        this.$el.querySelectorAll("[data-time]").forEach((el) => {
+          const time = el.getAttribute("data-time");
+          if (time) {
+            el.textContent = Alpine.store("utils").formatRelativeTime(time);
+          }
+        });
+      }, 60000);
+    },
+  }));
+});