refactor: provide a proper TUI interface with textual

pyproject.toml

@@ -6,6 +6,8 @@ readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
     "requests>=2.32.5",
+    "textual>=8.2.7",
+    "typed-argparse>=0.3.1",
 ]
 
 [build-system]
@@ -13,7 +15,7 @@ requires = ["setuptools>=61.0", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [project.scripts]
-pick-random-file = "random_file_picker.cli:main"
+pick-random-file = "random_file_picker.tui:main"
 
 [tool.uv.extra-build-dependencies]
 random-file-picker = ["setuptools"]