Task #9: Add priority editing in task detail view

- Added priority selector buttons (Low/Medium/High/Urgent) to task dialog
- Visual feedback with color coding (red=urgent, orange=high, blue=medium, gray=low)
- One-click priority changes, updates immediately
- Positioned above Status selector for logical flow

src/app/page.tsx

@@ -465,6 +465,32 @@ export default function Home() {
                   </div>
                 )}
 
+                {/* Priority */}
+                <div>
+                  <Label className="text-slate-400">Priority</Label>
+                  <div className="flex gap-2 mt-2">
+                    {(["low", "medium", "high", "urgent"] as Priority[]).map((priority) => (
+                      <button
+                        key={priority}
+                        onClick={() => updateTask(selectedTask.id, { priority })}
+                        className={`px-3 py-1.5 rounded-lg text-sm transition-colors capitalize ${
+                          selectedTask.priority === priority
+                            ? priority === "urgent"
+                              ? "bg-red-600 text-white"
+                              : priority === "high"
+                                ? "bg-orange-600 text-white"
+                                : priority === "medium"
+                                  ? "bg-blue-600 text-white"
+                                  : "bg-slate-600 text-white"
+                            : "bg-slate-800 text-slate-400 hover:bg-slate-700"
+                        }`}
+                      >
+                        {priority}
+                      </button>
+                    ))}
+                  </div>
+                </div>
+
                 {/* Status */}
                 <div>
                   <Label className="text-slate-400">Status</Label>