refactor(ui): simplify executions table and add version display

- Add version number (v0.1.0) to navigation header
- Simplify duration formatting to always display in seconds
- Right-align duration column for better readability
- Remove expert mode badge from executions table

Author: alvagante

frontend/src/components/Navigation.svelte

@@ -30,10 +30,11 @@
   <div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8">
     <div class="flex h-16 items-center justify-between">
       <div class="flex items-center">
-        <div class="flex-shrink-0">
+        <div class="flex flex-shrink-0 items-baseline gap-2">
           <h1 class="text-2xl font-bold text-primary-600 dark:text-primary-400">
             Pabawi
           </h1>
+          <span class="text-xs text-gray-500 dark:text-gray-400">v0.1.0</span>
         </div>
         <div class="ml-10 flex items-baseline space-x-4">
           {#each navItems as item}

frontend/src/pages/ExecutionsPage.svelte

@@ -191,23 +191,18 @@
     return new Date(timestamp).toLocaleString();
   }
 
-  // Format duration
+  // Format duration - always in seconds
   function formatDuration(startedAt: string, completedAt?: string): string {
     if (!completedAt) {
-      return 'In progress';
+      return '-';
     }
 
     const start = new Date(startedAt).getTime();
     const end = new Date(completedAt).getTime();
     const durationMs = end - start;
+    const durationSeconds = (durationMs / 1000).toFixed(1);
 
-    if (durationMs < 1000) {
-      return `${durationMs}ms`;
-    } else if (durationMs < 60000) {
-      return `${(durationMs / 1000).toFixed(1)}s`;
-    } else {
-      return `${(durationMs / 60000).toFixed(1)}m`;
-    }
+    return `${durationSeconds}s`;
   }
 
   // Get type badge color
@@ -504,7 +499,7 @@
                 <th scope="col" class="px-6 py-3 text-left text-xs font-medium uppercase tracking-wider text-gray-500 dark:text-gray-400">
                   Started
                 </th>
-                <th scope="col" class="px-6 py-3 text-left text-xs font-medium uppercase tracking-wider text-gray-500 dark:text-gray-400">
+                <th scope="col" class="px-6 py-3 text-right text-xs font-medium uppercase tracking-wider text-gray-500 dark:text-gray-400">
                   Duration
                 </th>
               </tr>
@@ -529,14 +524,6 @@
                           Live
                         </span>
                       {/if}
-                      {#if execution.expertMode}
-                        <span class="inline-flex items-center rounded-full bg-amber-100 px-2 py-1 text-xs font-medium text-amber-800 dark:bg-amber-900/20 dark:text-amber-400" title="Expert mode was enabled">
-                          <svg class="mr-1 h-3 w-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z" />
-                          </svg>
-                          Expert
-                        </span>
-                      {/if}
                     </div>
                   </td>
                   <td class="px-6 py-4 text-sm text-gray-900 dark:text-white">
@@ -571,7 +558,7 @@
                   <td class="whitespace-nowrap px-6 py-4 text-sm text-gray-600 dark:text-gray-400">
                     {formatTimestamp(execution.startedAt)}
                   </td>
-                  <td class="whitespace-nowrap px-6 py-4 text-sm text-gray-600 dark:text-gray-400">
+                  <td class="whitespace-nowrap px-6 py-4 text-right text-sm text-gray-600 dark:text-gray-400">
                     {formatDuration(execution.startedAt, execution.completedAt)}
                   </td>
                 </tr>