fix: open milestone tasks in slide-in

[mancinux]

fixes #4570

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="app/assets/js/pages/MilestonePage/index.tsx" line_range="233-242" />
<code_context>
+    [milestone.id, projectId, updateTaskMilestone],
+  );
+
+  const handleTaskDelete = React.useCallback(
+    async (taskId: string) => {
+      const result = await deleteTask(taskId);
+
+      if (!result?.success) return;
+
+      if (milestone.project?.id) {
+        PageCache.invalidate(projectPageCacheKey(milestone.project.id));
+      }
+    },
+    [deleteTask, milestone.project?.id],
+  );
+
</code_context>
<issue_to_address>
**issue (bug_risk):** Task delete handler should also invalidate the milestone page/kanban caches

In `handleTaskDelete`, only `projectPageCacheKey(milestone.project.id)` is invalidated. Because the milestone page and kanban views also show this task, you should also invalidate `pageCacheKey(milestone.id)` and `milestoneKanbanPageCacheKey(milestone.id)` to avoid stale UIs and keep behavior consistent with the move/milestone-change flows.
</issue_to_address>

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