fix(fe,container): remove unnecessary border colors (#233)

* feat(fe): border color issue

* fix(fe): remove unused borderColor and borderStyle variables in _renderTabBar

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: huteng <huteng@echo.tech>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

fe/packages/container/src/pages/miniApp/miniApp.js

@@ -903,17 +903,15 @@ export class MiniApp {
 		this.tabBarEl = this.el.querySelector('.dimina-mini-app__tabbar')
 		if (!this.tabBarEl) return
 
-		const { color, backgroundColor, borderStyle, list } = this.tabBarConfig
+		const { color, backgroundColor, list } = this.tabBarConfig
 		const normalColor = this._sanitizeCssColor(color) || '#999999'
 		const bg = this._sanitizeCssColor(backgroundColor) || '#ffffff'
-		const borderColor = borderStyle === 'white' ? '#FFFFFF' : '#E0E0E0'
 
 		// 用 DOM API 构建，避免 innerHTML 拼接被配置中的引号 / HTML 片段污染宿主 DOM
 		this.tabBarEl.textContent = ''
 		const tabbar = document.createElement('div')
 		tabbar.className = 'dimina-tabbar'
-		tabbar.style.backgroundColor = bg
-		tabbar.style.borderTop = `0.5px solid ${borderColor}`
+		tabbar.style.backgroundColor = bg;
 
 		list.forEach((item, index) => {
 			const path = this._normalizePagePath(item.pagePath)
@@ -1162,11 +1160,7 @@ export class MiniApp {
 		// 2. 更新已渲染的 tabbar DOM（背景 / 边框）
 		const tabbar = this.tabBarEl.querySelector('.dimina-tabbar')
 		if (tabbar) {
-			if (safeBg) tabbar.style.backgroundColor = safeBg
-			if (validBorderStyle) {
-				const borderColor = validBorderStyle === 'white' ? '#FFFFFF' : '#E0E0E0'
-				tabbar.style.borderTop = `0.5px solid ${borderColor}`
-			}
+			if (safeBg) tabbar.style.backgroundColor = safeBg;
 		}
 
 		// 3. 文字颜色按当前选中态重新刷一遍（同时处理 color 和 selectedColor）