Use bubbletea instead of survey for interacting with TUI (#786)

Fix #772

Reviewed-on: https://gitea.com/gitea/tea/pulls/786
Reviewed-by: Bo-Yi Wu (吳柏毅) <appleboy.tw@gmail.com>

modules/theme/theme.go

@@ -0,0 +1,23 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package theme
+
+import (
+	"github.com/charmbracelet/huh"
+	"github.com/charmbracelet/lipgloss"
+)
+
+var giteaTheme = func() *huh.Theme {
+	theme := huh.ThemeCharm()
+
+	title := lipgloss.AdaptiveColor{Light: "#02BA84", Dark: "#02BF87"}
+	theme.Focused.Title = theme.Focused.Title.Foreground(title).Bold(true)
+	theme.Blurred = theme.Focused
+	return theme
+}()
+
+// GetTheme returns the Gitea theme for Huh
+func GetTheme() *huh.Theme {
+	return giteaTheme
+}