feat(layout): 添加侧边栏并优化布局结构

- 在 +layout.svelte 中引入 Sidebar 组件并调整整体布局
- 使用 Flexbox 实现侧边栏与主内容区域的响应式布局
- 更新 Header 样式，使用 fixed 定位并添加阴影效果- 新增全局 CSS 变量以统一背景色调
- 添加 @tauri-apps/plugin-store依赖用于本地存储功能
- 创建 Sidebar 组件，包含导航图标及交互逻辑- 移除页面中旧的临时导航列表，替换为新布局结构
- 调整样式细节，增强视觉一致性和用户体验

package-lock.json

@@ -8,7 +8,8 @@
 			"name": "it-tools",
 			"version": "0.0.1",
 			"dependencies": {
-				"@tauri-apps/api": "^2.9.0"
+				"@tauri-apps/api": "^2.9.0",
+				"@tauri-apps/plugin-store": "^2.4.1"
 			},
 			"devDependencies": {
 				"@sveltejs/adapter-static": "^3.0.10",
@@ -866,7 +867,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@standard-schema/spec": "^1.0.0",
 				"@sveltejs/acorn-typescript": "^1.0.5",
@@ -906,7 +906,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@sveltejs/vite-plugin-svelte-inspector": "^5.0.0",
 				"debug": "^4.4.1",
@@ -1439,6 +1438,15 @@
 				"node": ">= 10"
 			}
 		},
+		"node_modules/@tauri-apps/plugin-store": {
+			"version": "2.4.1",
+			"resolved": "https://registry.npmjs.org/@tauri-apps/plugin-store/-/plugin-store-2.4.1.tgz",
+			"integrity": "sha512-ckGSEzZ5Ii4Hf2D5x25Oqnm2Zf9MfDWAzR+volY0z/OOBz6aucPKEY0F649JvQ0Vupku6UJo7ugpGRDOFOunkA==",
+			"license": "MIT OR Apache-2.0",
+			"dependencies": {
+				"@tauri-apps/api": "^2.8.0"
+			}
+		},
 		"node_modules/@types/cookie": {
 			"version": "0.6.0",
 			"resolved": "https://registry.npmmirror.com/@types/cookie/-/cookie-0.6.0.tgz",
@@ -1459,7 +1467,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"acorn": "bin/acorn"
 			},
@@ -2048,7 +2055,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"engines": {
 				"node": ">=12"
 			},
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"prettier": "bin/prettier.cjs"
 			},
@@ -2108,7 +2113,6 @@
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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"
@@ -2300,7 +2304,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@jridgewell/remapping": "^2.3.4",
 				"@jridgewell/sourcemap-codec": "^1.5.0",
@@ -2399,7 +2402,6 @@
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 			"dev": true,
 			"license": "Apache-2.0",
-			"peer": true,
 			"bin": {
 				"tsc": "bin/tsc",
 				"tsserver": "bin/tsserver"
@@ -2414,7 +2416,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"esbuild": "^0.25.0",
 				"fdir": "^6.5.0",