refactor: Simplify --install-shortcut to always replace conflicting bindings

Changed behavior to always silently replace any existing 'bind a' without
prompting. This makes the installation simpler and more predictable for
automated setups.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/autoclaude/cli.py

@@ -467,36 +467,13 @@ class ClaudeCLI:
             self.print_info("Shortcut already configured in ~/.tmux.conf")
             return
 
-        # Check if 'bind a' is already used by something else
+        # Remove any existing 'bind a' line (replace it)
         import re
         if re.search(r'^\s*bind\s+a\s+', content, re.MULTILINE):
-            self.print_warning("The key 'a' is already bound in your tmux config")
-            self.print_info("Current binding:")
-            for line in content.split('\n'):
-                if re.search(r'^\s*bind\s+a\s+', line):
-                    print(f"  {line.strip()}")
-            print()
-            self.print_info("Options:")
-            print("  1. Replace the existing binding")
-            print("  2. Use a different key")
-            print("  3. Cancel installation")
-            choice = input(f"\n{Colors.BOLD}Choose option (1-3): {Colors.ENDC}")
-
-            if choice == '1':
-                # Remove existing 'bind a' line
-                lines = content.split('\n')
-                lines = [l for l in lines if not re.search(r'^\s*bind\s+a\s+', l)]
-                content = '\n'.join(lines)
-            elif choice == '2':
-                key = input(f"{Colors.BOLD}Enter key to use (e.g., 'b', 'c'): {Colors.ENDC}")
-                if len(key) != 1 or not key.isalpha():
-                    self.print_error("Invalid key. Must be a single letter.")
-                    return
-                # Continue with the custom key
-                return self._add_shortcut_binding(tmux_conf, content, key)
-            else:
-                self.print_info("Installation cancelled")
-                return
+            self.print_info("Replacing existing 'bind a' binding")
+            lines = content.split('\n')
+            lines = [l for l in lines if not re.search(r'^\s*bind\s+a\s+', l)]
+            content = '\n'.join(lines)
 
         # Get the full path to autoclaude-toggle script
         script_path = Path(__file__).parent.parent.parent / '.local' / 'bin' / 'autoclaude-toggle'
@@ -507,16 +484,16 @@ class ClaudeCLI:
             self.print_error(f"autoclaude-toggle script not found")
             return
 
-        self._add_shortcut_binding(tmux_conf, content, 'a')
+        self._add_shortcut_binding(tmux_conf, content)
 
-    def _add_shortcut_binding(self, tmux_conf: Path, content: str, key: str):
+    def _add_shortcut_binding(self, tmux_conf: Path, content: str):
         script_path = Path.home() / '.local' / 'bin' / 'autoclaude-toggle'
 
         # Add the keybinding to tmux config
-        binding = f'\n# Toggle autoclaude automation for active pane and show status\nbind {key} run-shell "{script_path}"\n'
+        binding = f'\n# Toggle autoclaude automation for active pane and show status\nbind a run-shell "{script_path}"\n'
 
         tmux_conf.write_text(content + binding)
-        self.print_success(f"Added Ctrl+A+{key.upper()} shortcut to ~/.tmux.conf")
+        self.print_success(f"Added Ctrl+A+A shortcut to ~/.tmux.conf")
         self.print_info("Reload tmux config with: tmux source-file ~/.tmux.conf")
         self.print_info("Or restart your tmux session")