feat(settings): add local storage tab to display IndexedDB usage and site quota

web/src/i18n/locales/en-US.ts

@@ -357,12 +357,29 @@ export default {
     config: {
         title: "Settings & Preferences",
         invalidFile: "The settings file format is invalid",
-        description: "Provider aggregation, model selection, and sync preferences",
-        modalDescription: "Provider aggregation, default models, and sync preferences",
+        description: "Providers, model selection, sync, and local storage",
+        modalDescription: "Providers, default models, sync, and local storage",
         tabs: {
             channels: "Providers",
             preferences: "Preferences",
             promptSources: "Prompt sources",
+            localStorage: "Local storage",
+        },
+        localStorage: {
+            title: "IndexedDB storage usage",
+            description: "View browser data saved by Infinite Canvas, grouped by object store.",
+            indexedDbUsage: "IndexedDB usage",
+            siteUsage: "Total site usage",
+            quota: "Available quota",
+            contentEstimate: "Estimated from stored content",
+            siteUsageHint: "Includes IndexedDB and other site data",
+            quotaHint: "Allocated dynamically by the browser",
+            quotaProgress: "Site quota usage",
+            mainDatabase: "Infinite Canvas data",
+            records: "{{count}} records",
+            refresh: "Refresh usage",
+            readFailed: "Failed to read local storage",
+            stores: { appState: "App state", images: "Image files", media: "Audio and video files", imageLogs: "Image history", videoLogs: "Video history", agentMessages: "Agent messages", promptCache: "Prompt cache" },
         },
         promptSources: {
             add: "Add source",

web/src/i18n/locales/zh-CN.ts

@@ -357,12 +357,29 @@ export default {
     config: {
         title: "配置与用户偏好",
         invalidFile: "配置文件格式不正确",
-        description: "渠道聚合、模型选择和同步偏好",
-        modalDescription: "渠道聚合、默认模型和同步偏好",
+        description: "渠道聚合、模型选择、同步与本地存储",
+        modalDescription: "渠道聚合、默认模型、同步与本地存储",
         tabs: {
             channels: "渠道",
             preferences: "偏好设置",
             promptSources: "提示词来源",
+            localStorage: "本地存储",
+        },
+        localStorage: {
+            title: "IndexedDB 存储使用情况",
+            description: "查看 Infinite Canvas 在浏览器中保存的数据量，并按对象仓库统计内容体积。",
+            indexedDbUsage: "IndexedDB 占用",
+            siteUsage: "站点总占用",
+            quota: "可用配额",
+            contentEstimate: "按仓库内容估算",
+            siteUsageHint: "包含 IndexedDB 等站点数据",
+            quotaHint: "由浏览器动态分配",
+            quotaProgress: "站点配额使用率",
+            mainDatabase: "Infinite Canvas 主数据",
+            records: "{{count}} 条",
+            refresh: "刷新统计",
+            readFailed: "读取本地存储失败",
+            stores: { appState: "应用状态", images: "图片文件", media: "音视频文件", imageLogs: "生图记录", videoLogs: "视频记录", agentMessages: "Agent 消息", promptCache: "提示词缓存" },
         },
         promptSources: {
             add: "新增来源",