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/settings-export.ts

@@ -5,7 +5,7 @@ import { resolveProject } from "../project-context.js";
 
 /**
  * Run settings export command.
- * Usage: kb settings export [--output <path>] [--scope global|project|both]
+ * Usage: fn settings export [--output <path>] [--scope global|project|both]
  *
  * @param options.output - Custom output file path (optional, auto-generates if not provided)
  * @param options.scope - Which settings to export: 'global', 'project', or 'both' (default: 'both')