debug: add temporary history overlay

src/app/ui.py

@@ -60,6 +60,9 @@ def build_render_lines(navigator: Navigator) -> list[RenderLine]:
 class TerminalUI:
     """Minimal curses UI for the directory navigator MVP."""
 
+    def __init__(self) -> None:
+        self._show_history_debug = False
+
     def run(self, navigator: Navigator) -> Path:
         """Start the interactive session and return the final directory path."""
 
@@ -114,6 +117,10 @@ class TerminalUI:
                 navigator.go_forward()
                 continue
 
+            if key == ord("h"):
+                self._show_history_debug = not self._show_history_debug
+                continue
+
             if key in (curses.KEY_ENTER, 10, 13):
                 navigator.enter_selected_directory()
 
@@ -131,8 +138,26 @@ class TerminalUI:
             attributes = curses.A_REVERSE if line.is_selected else curses.A_NORMAL
             stdscr.addnstr(row, 0, line.text, width - 1, attributes)
 
+        if self._show_history_debug:
+            self._render_history_debug(stdscr, navigator, width=width, height=height)
+
         stdscr.refresh()
 
+    def _render_history_debug(
+        self, stdscr: curses.window, navigator: Navigator, width: int, height: int
+    ) -> None:
+        history_entries = navigator.history.entries()
+        start_row = 1
+
+        stdscr.addnstr(start_row, 0, "History:", width - 1, curses.A_BOLD)
+
+        for index, path in enumerate(history_entries, start=1):
+            row = start_row + index
+            if row >= height:
+                break
+
+            stdscr.addnstr(row, 0, str(path), width - 1)
+
 
 @contextmanager
 def open_terminal_streams() -> Iterator[tuple[TextIO, TextIO]]: