feat: GitHub-link op DONE-card + pushed_at doorvoer

- lib/job-status-url.ts: getBranchUrl(repoUrl, branch) → GitHub tree URL
- JobState + ClaudeJobEvent: pushed_at? veld toegevoegd
- realtime/solo/route.ts: pushed_at in Prisma-select, JobPayload en mapping
- SoloBoardProps + TaskDetailDialog: repoUrl prop doorgevoerd
- task-detail-dialog: "Open op GitHub"-link als done + pushed_at + branch + repoUrl
- 3 unit-tests voor getBranchUrl; totaal 261 tests groen

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/api/realtime/solo/route.ts

@@ -45,6 +45,7 @@ type JobPayload = {
   product_id: string
   status: string
   branch?: string
+  pushed_at?: string
   summary?: string
   error?: string
 }
@@ -258,7 +259,7 @@ async function prisma_jobs_findActive(userId: string, productId: string) {
       ],
     },
     select: {
-      id: true, task_id: true, status: true, branch: true, summary: true, error: true,
+      id: true, task_id: true, status: true, branch: true, pushed_at: true, summary: true, error: true,
     },
     orderBy: { created_at: 'asc' },
   })
@@ -267,6 +268,7 @@ async function prisma_jobs_findActive(userId: string, productId: string) {
     task_id: j.task_id,
     status: jobStatusToApi(j.status),
     branch: j.branch ?? undefined,
+    pushed_at: j.pushed_at?.toISOString() ?? undefined,
     summary: j.summary ?? undefined,
     error: j.error ?? undefined,
   }))