feat(ui): 条目管理增强 — 重命名/删除/重排序

每行右侧增加 ⋯ 按钮，弹出菜单支持重命名、删除、上移、下移。
- renameEntry / deleteEntry / moveEntry 三个 appState 方法
- rowActionMenu 弹出菜单 + renameDialog + confirmDeleteDialog
- 删除自动注销快捷键，所有操作触发配置保存
- 保留顶栏 Add/Remove 全局按钮不变

internal/ui/dialog_rename.go

@@ -0,0 +1,54 @@
+package ui
+
+import (
+	"strings"
+
+	"gioui.org/layout"
+	"gioui.org/widget"
+	"gioui.org/widget/material"
+
+	"git.wxccs.org/iceking2nd/winauth-go/internal/i18n"
+)
+
+type renameDialog struct {
+	ed     widget.Editor
+	okBtn  widget.Clickable
+	cancel widget.Clickable
+	errMsg string
+}
+
+func newRenameDialog(currentName string) *renameDialog {
+	d := &renameDialog{}
+	d.ed.SingleLine = true
+	d.ed.SetText(currentName)
+	return d
+}
+
+func (d *renameDialog) Layout(
+	gtx layout.Context, th *material.Theme,
+	onDone func(string, bool),
+) layout.Dimensions {
+	if d.cancel.Clicked(gtx) {
+		onDone("", true)
+		return layout.Dimensions{Size: gtx.Constraints.Max}
+	}
+	if d.okBtn.Clicked(gtx) {
+		name := strings.TrimSpace(d.ed.Text())
+		if name == "" {
+			d.errMsg = i18n.T("msg_empty_name")
+		} else {
+			onDone(name, false)
+			return layout.Dimensions{Size: gtx.Constraints.Max}
+		}
+	}
+
+	body := func(gtx layout.Context) layout.Dimensions {
+		return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
+			layout.Rigid(labeledEditor(th, i18n.T("label_entry_name"), &d.ed, "")),
+			layout.Rigid(errorLabel(th, d.errMsg)),
+		)
+	}
+	return modalCard(gtx, th, i18n.T("dialog_rename_title"),
+		i18n.T("btn_ok"), i18n.T("btn_cancel"),
+		&d.okBtn, &d.cancel, body)
+}