fix(ui): use tea.Quit for ctrl+q to return exit code 0

ctrl+q is an intentional quit action and should return success (exit
code 0). Changed from tea.Interrupt (non-zero exit) to tea.Quit.

tea.Interrupt should be reserved for actual error conditions or
unhandled panics, not user-initiated graceful exits.

Also applies to regular 'q' in nav mode which already used tea.Quit
correctly.

Closes #173

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: cpcloud

internal/app/chat.go

@@ -1077,7 +1077,7 @@ func (m *Model) handleChatKey(key tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.deactivateCompleter()
 			return m, nil
 		case "ctrl+q":
-			return m, tea.Interrupt
+			return m, tea.Quit
 		}
 	}
 

internal/app/model.go

@@ -145,7 +145,7 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case tea.KeyMsg:
 		if typed.String() == "ctrl+q" {
 			m.cancelChatOperations()
-			return m, tea.Interrupt
+			return m, tea.Quit
 		}
 		if typed.String() == "ctrl+c" {
 			// Cancel any ongoing LLM operations but don't quit.