fix: restore Ctrl+Alt+Key hotkeys and dedup normalizeHotkey

- Call enableVTInput after tea.NewProgram to restore VT input mode
  on Windows (bubbletea v1 conInputReader disables it, breaking
  Ctrl+Alt+Key combos)
- Move normalizeHotkey to internal/config.NormalizeHotkey, eliminate
  duplicate implementations in tui and console packages
- Remove unused Sess() getter from App

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/config/config.go

@@ -4,6 +4,7 @@ package config
 import (
 	"fmt"
 	"os"
+	"strings"
 	"time"
 )
 
@@ -28,6 +29,15 @@ type Config struct {
 	HotkeyMod   string
 }
 
+// NormalizeHotkey validates and normalizes a hotkey modifier string.
+func NormalizeHotkey(mod string) string {
+	mod = strings.ToLower(strings.TrimSpace(mod))
+	if mod != "ctrl+alt" && mod != "ctrl+shift" {
+		mod = "ctrl+alt"
+	}
+	return mod
+}
+
 // OpenLogFile opens the configured log file for writing, or returns nil if logging is disabled.
 func OpenLogFile(cfg *Config) (*os.File, error) {
 	if cfg.EnableLog {

internal/console/console.go

@@ -66,6 +66,7 @@ func Run() {
 	if cfg.EnableGUI {
 		model := tui.New(appInst)
 		p := tea.NewProgram(model, tea.WithAltScreen(), tea.WithoutSignalHandler())
+		enableVTInput(int(os.Stdin.Fd())) // Restore VT input for Ctrl+Alt+Key hotkeys
 		if _, err = p.Run(); err != nil {
 			fmt.Fprintf(os.Stderr, "tui failed: %v\n", err)
 			os.Exit(1)
@@ -336,13 +337,7 @@ func isExitHotkeySeq(seq []byte, cfg *config.Config) bool {
 	return false
 }
 
-func normalizeHotkey(mod string) string {
-	mod = strings.ToLower(strings.TrimSpace(mod))
-	if mod != "ctrl+alt" && mod != "ctrl+shift" {
-		mod = "ctrl+alt"
-	}
-	return mod
-}
+func normalizeHotkey(mod string) string { return config.NormalizeHotkey(mod) }
 
 func echoConsoleByte(out io.Writer, b byte)        { _, _ = out.Write([]byte{b}) }
 func echoConsoleNewline(out io.Writer)              { _, _ = io.WriteString(out, "\r\n") }

internal/tui/hotkeys.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/jixishi/SerialTerminalForWindowsTerminal/internal/config"
 	"github.com/jixishi/SerialTerminalForWindowsTerminal/internal/event"
 )
 
@@ -55,13 +56,7 @@ func (m *Model) isLocalHotkey(key, action string) bool {
 	return hasCtrl && hasAlt
 }
 
-func normalizeHotkeyPrefix(mod string) string {
-	mod = strings.ToLower(strings.TrimSpace(mod))
-	if mod != "ctrl+alt" && mod != "ctrl+shift" {
-		mod = "ctrl+alt"
-	}
-	return mod
-}
+func normalizeHotkeyPrefix(mod string) string { return config.NormalizeHotkey(mod) }
 
 func hotkeyWith(mod, action string) string {
 	return normalizeHotkeyPrefix(mod) + "+" + action