Integrate Alpine.js for reactive UI

- Add Alpine.js (self-hosted, embedded in static/)
- Refactor app.js to use Alpine.js stores and components
- Update templates to use x-data, x-bind, x-show, x-text directives
- Add reactive deploy button state, live logs, status badges
- Add auto-dismiss alerts with close button and transitions
- Add copy-to-clipboard component with feedback
- Add confirm dialog component for destructive actions
- Add relative time component with auto-update
- Add prettier to make fmt target for JS formatting

templates/dashboard.html

@@ -5,7 +5,7 @@
 {{define "content"}}
 {{template "nav" .}}
 
-<main class="max-w-6xl mx-auto px-4 py-8">
+<main class="max-w-6xl mx-auto px-4 py-8" x-data="dashboard()">
     {{template "alert-success" .}}
     {{template "alert-error" .}}
 
@@ -58,9 +58,7 @@
                     </td>
                     <td class="text-gray-500 text-sm">
                         {{if .LastDeployTime}}
-                        <span class="relative-time cursor-default" data-time="{{.LastDeployISO}}" title="{{.LastDeployLabel}}">
-                            {{.LastDeployLabel}}
-                        </span>
+                        <span x-data="relativeTime('{{.LastDeployISO}}')" x-text="display" class="cursor-default" title="{{.LastDeployLabel}}"></span>
                         {{else}}
                         <span class="text-gray-400">-</span>
                         {{end}}