feat(ui): 更新页面布局与样式提升用户体验

- 移除无用的空<style>标签
- 安装页面文本提示优化及布局调整
- 首页添加交互式安装按钮并完善页面内容- 全局字体引入并设置默认字体为MiSans- 添加窗口关闭权限以支持功能完整控制
- 头部组件模糊效果样式微调- 视频壁纸组件宽度适配全屏- package-lock.json依赖更新，移除多余peer标记
- 引入sass作为可选样式预处理器支持

package-lock.json

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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@standard-schema/spec": "^1.0.0",
 				"@sveltejs/acorn-typescript": "^1.0.5",
@@ -1242,7 +1241,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@sveltejs/vite-plugin-svelte-inspector": "^5.0.0",
 				"debug": "^4.4.1",
@@ -1822,7 +1820,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"acorn": "bin/acorn"
 			},
@@ -2552,7 +2549,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"engines": {
 				"node": ">=12"
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@@ -2595,7 +2591,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"prettier": "bin/prettier.cjs"
 			},
@@ -2612,7 +2607,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"peerDependencies": {
 				"prettier": "^3.0.0",
 				"svelte": "^3.2.0 || ^4.0.0-next.0 || ^5.0.0-next.0"
@@ -2776,13 +2770,34 @@
 				"node": ">=6"
 			}
 		},
+		"node_modules/sass": {
+			"version": "1.93.3",
+			"resolved": "https://registry.npmmirror.com/sass/-/sass-1.93.3.tgz",
+			"integrity": "sha512-elOcIZRTM76dvxNAjqYrucTSI0teAF/L2Lv0s6f6b7FOwcwIuA357bIE871580AjHJuSvLIRUosgV+lIWx6Rgg==",
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"dependencies": {
+				"chokidar": "^4.0.0",
+				"immutable": "^5.0.2",
+				"source-map-js": ">=0.6.2 <2.0.0"
+			},
+			"bin": {
+				"sass": "sass.js"
+			},
+			"engines": {
+				"node": ">=14.0.0"
+			},
+			"optionalDependencies": {
+				"@parcel/watcher": "^2.4.1"
+			}
+		},
 		"node_modules/sass-embedded": {
 			"version": "1.93.3",
 			"resolved": "https://registry.npmmirror.com/sass-embedded/-/sass-embedded-1.93.3.tgz",
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@bufbuild/protobuf": "^2.5.0",
 				"buffer-builder": "^0.2.0",
@@ -3180,7 +3195,6 @@
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 			"license": "MIT",
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 			"dependencies": {
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 				"@jridgewell/sourcemap-codec": "^1.5.0",
@@ -3323,7 +3337,6 @@
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 			"dev": true,
 			"license": "Apache-2.0",
-			"peer": true,
 			"bin": {
 				"tsc": "bin/tsc",
 				"tsserver": "bin/tsserver"
@@ -3345,7 +3358,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"esbuild": "^0.25.0",
 				"fdir": "^6.5.0",