Add arrow-key menus and report loading status

wizard: when stdin and stdout are both TTYs, menus render inline and
are driven by keys: up/down/j/k/Home/End move the bold '>' highlight,
Enter accepts, Esc/Ctrl-C/q back out of cancellable menus while Ctrl-C
on fixed menus still aborts. Rows redraw with erase+CR across the
option block only and clear before returning so prompts stay aligned.
Non-TTY stdio keeps the original numbered prompt verbatim.

report: each configured source shows a transient "# Generating
report: pulling <name> data..." line that is erased on completion,
only when stdout is a TTY; piped output remains exactly the report.

tests: cover the numbered fallback, row rendering, status suppression
and show+clear parity; reformat stray test files to satisfy ruff.

tests/test_wizard.py

@@ -0,0 +1,58 @@
+"""Unit tests for the wizard menus — scripted input, no raw terminal involved."""
+
+from __future__ import annotations
+
+import io
+import sys
+import unittest
+from unittest import mock
+
+from weekly_activity.wizard import _menu, _option_line
+
+
+class NumberedMenuFallbackTest(unittest.TestCase):
+    """When stdin/stdout are not a TTY the numbered prompt stays as it was."""
+
+    def run_numbered(self, answers: list[str], options: list[str], *, cancellable: bool = False):
+        """Run _menu with forced non-TTY stdio and scripted interactive answers."""
+        fake_stdin, fake_stdout = io.StringIO(), io.StringIO()
+        with (
+            mock.patch.object(sys, "stdin", fake_stdin),
+            mock.patch.object(sys, "stdout", fake_stdout),
+            mock.patch("builtins.input", side_effect=iter(answers)),
+        ):
+            picked = _menu("Pick one", options, cancellable=cancellable)
+        return picked, fake_stdout.getvalue()
+
+    def test_returns_zero_based_index_of_chosen_option(self) -> None:
+        picked, output = self.run_numbered(["2"], ["Alpha", "Beta", "Gamma"])
+        self.assertEqual(picked, 1)
+        self.assertIn("Pick one", output)
+        self.assertIn("  2) Beta", output)
+
+    def test_empty_answer_backs_out_of_cancellable_menu(self) -> None:
+        picked, _ = self.run_numbered([""], ["Alpha", "Beta"], cancellable=True)
+        self.assertIsNone(picked)
+
+    def test_back_number_returns_none(self) -> None:
+        picked, _ = self.run_numbered(["3"], ["Alpha", "Beta"], cancellable=True)
+        self.assertIsNone(picked)
+
+    def test_invalid_answers_loop_until_valid_one(self) -> None:
+        picked, output = self.run_numbered(["9", "nope", "3"], ["Alpha", "Beta", "Gamma"])
+        self.assertEqual(picked, 2)
+        self.assertEqual(output.count("Please enter a number between 1 and 3."), 2)
+
+
+class OptionLineRenderingTest(unittest.TestCase):
+    """Selected rows carry the '>' marker and bold codes; others stay plain."""
+
+    def test_selected_line_is_bold_and_marked(self) -> None:
+        self.assertEqual(_option_line("Exit", True), "\x1b[1m> Exit\x1b[0m")
+
+    def test_unselected_line_is_indented_and_plain(self) -> None:
+        self.assertEqual(_option_line("Remove a source", False), "  Remove a source")
+
+
+if __name__ == "__main__":
+    unittest.main()