feat(FN-1163): align command references with fn naming

- Update CLI command strings, help text, and project-resolution messaging to reference fn
- Sync core backup/store messaging and dashboard API/planning/subtask prompt examples with fn usage
- Refresh dashboard UI copy in settings, project detection, and PR guidance for consistent command naming
- Adjust CLI/dashboard tests and add a @gsxdsm/fusion changeset for the naming alignment patch

packages/cli/src/commands/task.ts

@@ -158,7 +158,7 @@ export async function runTaskList(projectName?: string) {
   const tasks = await store.listTasks();
 
   if (tasks.length === 0) {
-    console.log("\n  No tasks yet. Create one with: kb task create\n");
+    console.log("\n  No tasks yet. Create one with: fn task create\n");
     process.exit(0);
   }