feat(frontend): add raw HTML render + per-row actions to DashboardDataGrid

- Column.raw flag: render() output injected as HTML (for styled badges)
- Actions prop: per-row action buttons rendered as final column
  - Each action has label, handler, variant, condition, disabled
- Enables RepositoryDashboardGrid to delegate rendering to DataGrid

frontend/src/lib/components/dashboard/DashboardDataGrid.svelte

@@ -42,6 +42,8 @@
     class?: string;
     /** Custom cell render — returns display string */
     render?: (item: any) => string;
+    /** If true, render() output is injected as HTML (for styled badges, etc.) */
+    raw?: boolean;
   }
 
   // [SECTION: PROPS]
@@ -79,6 +81,15 @@
 
     // Snippet for bulk actions bar (shown above table when items are selected)
     children = undefined,
+
+    // Per-row action buttons (rendered as a final column)
+    actions = [] as Array<{
+      label: string;
+      handler: (item: any) => void;
+      variant?: string;
+      condition?: (item: any) => boolean;
+      disabled?: (item: any) => boolean;
+    }>,
   } = $props();
 
   // [SECTION: HELPERS]
@@ -255,6 +266,11 @@
                 {/if}
               </th>
             {/each}
+            {#if actions.length > 0}
+              <th scope="col" class="px-6 py-3 text-left text-xs font-medium text-text-muted uppercase tracking-wider">
+                Actions
+              </th>
+            {/if}
           </tr>
         </thead>
         <tbody class="bg-surface-card divide-y divide-border">
@@ -275,9 +291,34 @@
                   class="px-6 py-4 whitespace-nowrap text-sm {col.class || ''}"
                   style={col.width ? `width:${col.width}` : ""}
                 >
-                  {col.render ? col.render(item) : item[col.key]}
+                  {#if col.render}
+                    {#if col.raw}
+                      {@html col.render(item)}
+                    {:else}
+                      {col.render(item)}
+                    {/if}
+                  {:else}
+                    {item[col.key]}
+                  {/if}
                 </td>
               {/each}
+              {#if actions.length > 0}
+                <td class="px-6 py-4 whitespace-nowrap text-sm">
+                  {#each actions as action}
+                    {#if !action.condition || action.condition(item)}
+                      <Button
+                        variant={action.variant || "ghost"}
+                        size="sm"
+                        onclick={() => action.handler(item)}
+                        disabled={action.disabled ? action.disabled(item) : false}
+                        class="mr-1"
+                      >
+                        {action.label}
+                      </Button>
+                    {/if}
+                  {/each}
+                </td>
+              {/if}
             </tr>
           {/each}
         </tbody>