🎨 Palette: Fix keyboard trap on TUI selector

.jules/palette.md

@@ -0,0 +1,3 @@
+## 2024-06-22 - TUI Keyboard Trap Fix
+**Learning:** When building terminal UIs with explicit raw mode reading (like bypassing `rich` prompt and using `tty.setraw`), standard interrupt combinations like Ctrl-C (`\x03`) do not raise `KeyboardInterrupt` by default. This causes a severe keyboard trap that prevents users from cleanly escaping out of selection states.
+**Action:** Always intercept `\x03` explicitly when parsing raw keystrokes in terminal interactions and manually raise `KeyboardInterrupt` to preserve accessible escape hatches.

libs/terminal_ui.py

@@ -19,6 +19,8 @@ def _read_key(self):
         if os.name == 'nt':
             import msvcrt
             key = msvcrt.getwch()
+            if key == '\x03':
+                raise KeyboardInterrupt('Selection cancelled by user.')
             if key in ('\x00', '\xe0'):
                 extended = msvcrt.getwch()
                 mapping = {'H': 'up', 'P': 'down', 'K': 'left', 'M': 'right'}
@@ -37,6 +39,8 @@ def _read_key(self):
         try:
             tty.setraw(fd)
             key = sys.stdin.read(1)
+            if key == '\x03':
+                raise KeyboardInterrupt('Selection cancelled by user.')
             if key == '\x1b':
                 next_chars = sys.stdin.read(2)
                 mapping = {'[A': 'up', '[B': 'down', '[D': 'left', '[C': 'right'}