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/core/src/backup.ts

@@ -401,9 +401,9 @@ export async function syncBackupAutomation(
   }
   
   // Build the backup command
-  // The CLI command will be: kb backup --auto
+  // The CLI command will be: fn backup --auto
   // The --auto flag indicates this is an automated run (can add special handling if needed)
-  const command = "kb backup --create";
+  const command = "fn backup --create";
   
   if (existingSchedule) {
     // Update existing schedule