feat(cli): add options for user, home, and working directory

- Add `--run-as` option to specify user for system-wide timers
- Add `--home` option to set the HOME environment variable
- Add `--cwd` option to define the working directory
- Update tests to validate new options and behavior

src/types/options.ts

@@ -4,6 +4,9 @@ export interface TimerOptions {
     calendar: string;
     description?: string;
     user?: boolean;
+    runAs?: string;
+    home?: string;
+    cwd?: string;
     output?: string;
     after?: string[];
     environment?: string[];