Fix file upload limits and UI performance issues

- Remove artificial 18MB file size restrictions across all layers
- Increase limits to industry standard: 5GB for file operations, 1GB for JSON
- Eliminate duplicate resize handlers causing UI instability
- Fix Terminal connection blank screen by removing 300ms delay
- Optimize clipboard state flow for copy/paste functionality
- Complete i18n implementation removing hardcoded strings
- Apply Linus principle: eliminate complexity, fix data structure issues

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/locales/en/translation.json

@@ -191,6 +191,7 @@
   },
   "common": {
     "close": "Close",
+    "minimize": "Minimize",
     "online": "Online",
     "offline": "Offline",
     "maintenance": "Maintenance",
@@ -661,7 +662,7 @@
     "deleteItem": "Delete Item",
     "currentPath": "Current Path",
     "uploadFileTitle": "Upload File",
-    "maxFileSize": "Max: 100MB (JSON) / 200MB (Binary)",
+    "maxFileSize": "Max: 1GB (JSON) / 5GB (Binary) - Large files supported",
     "removeFile": "Remove File",
     "clickToSelectFile": "Click to select a file",
     "chooseFile": "Choose File",
@@ -819,7 +820,46 @@
     "pinFile": "Pin file",
     "addToShortcuts": "Add to shortcuts",
     "selectLocationToSave": "Select location to save",
-    "downloadToDefaultLocation": "Download to default location"
+    "downloadToDefaultLocation": "Download to default location",
+    "pasteFailed": "Paste failed",
+    "noUndoableActions": "No undoable actions",
+    "undoCopySuccess": "Undid copy operation: Deleted {{count}} copied files",
+    "undoCopyFailedDelete": "Undo failed: Could not delete any copied files",
+    "undoCopyFailedNoInfo": "Undo failed: Could not find copied file information",
+    "undoMoveSuccess": "Undid move operation: Moved {{count}} files back to original location",
+    "undoMoveFailedMove": "Undo failed: Could not move any files back",
+    "undoMoveFailedNoInfo": "Undo failed: Could not find moved file information",
+    "undoDeleteNotSupported": "Delete operation cannot be undone: Files have been permanently deleted from server",
+    "undoTypeNotSupported": "Unsupported undo operation type",
+    "undoOperationFailed": "Undo operation failed",
+    "unknownError": "Unknown error",
+    "enterPath": "Enter path...",
+    "editPath": "Edit path",
+    "confirm": "Confirm",
+    "cancel": "Cancel",
+    "folderName": "Folder name",
+    "find": "Find...",
+    "replaceWith": "Replace with...",
+    "startTyping": "Start typing...",
+    "fileSavedSuccessfully": "File saved successfully",
+    "autoSaveFailed": "Auto-save failed",
+    "fileAutoSaved": "File auto-saved",
+    "fileDownloadedSuccessfully": "File downloaded successfully",
+    "moveFileFailed": "Failed to move {{name}}",
+    "moveOperationFailed": "Move operation failed",
+    "canOnlyCompareFiles": "Can only compare two files",
+    "comparingFiles": "Comparing files: {{file1}} and {{file2}}",
+    "dragFailed": "Drag operation failed",
+    "filePinnedSuccessfully": "File \"{{name}}\" pinned successfully",
+    "pinFileFailed": "Failed to pin file",
+    "fileUnpinnedSuccessfully": "File \"{{name}}\" unpinned successfully",
+    "unpinFileFailed": "Failed to unpin file",
+    "shortcutAddedSuccessfully": "Folder shortcut \"{{name}}\" added successfully",
+    "addShortcutFailed": "Failed to add shortcut",
+    "operationCompletedSuccessfully": "{{operation}} {{count}} items successfully",
+    "operationCompleted": "{{operation}} {{count}} items",
+    "downloadFileSuccess": "File {{name}} downloaded successfully",
+    "downloadFileFailed": "Download failed"
   },
   "tunnels": {
     "title": "SSH Tunnels",

src/locales/zh/translation.json

@@ -190,6 +190,7 @@
   },
   "common": {
     "close": "关闭",
+    "minimize": "最小化",
     "online": "在线",
     "offline": "离线",
     "maintenance": "维护中",
@@ -676,7 +677,7 @@
     "deleteItem": "删除项目",
     "currentPath": "当前路径",
     "uploadFileTitle": "上传文件",
-    "maxFileSize": "最大：100MB（JSON）/ 200MB（二进制）",
+    "maxFileSize": "最大：1GB（JSON）/ 5GB（二进制）- 支持大文件",
     "removeFile": "移除文件",
     "clickToSelectFile": "点击选择文件",
     "chooseFile": "选择文件",
@@ -826,7 +827,46 @@
     "pinFile": "固定文件",
     "addToShortcuts": "添加到快捷方式",
     "selectLocationToSave": "选择位置保存",
-    "downloadToDefaultLocation": "下载到默认位置"
+    "downloadToDefaultLocation": "下载到默认位置",
+    "pasteFailed": "粘贴失败",
+    "noUndoableActions": "没有可撤销的操作",
+    "undoCopySuccess": "已撤销复制操作：删除了 {{count}} 个复制的文件",
+    "undoCopyFailedDelete": "撤销失败：无法删除任何复制的文件",
+    "undoCopyFailedNoInfo": "撤销失败：找不到复制的文件信息",
+    "undoMoveSuccess": "已撤销移动操作：移回了 {{count}} 个文件到原位置",
+    "undoMoveFailedMove": "撤销失败：无法移回任何文件",
+    "undoMoveFailedNoInfo": "撤销失败：找不到移动的文件信息",
+    "undoDeleteNotSupported": "删除操作无法撤销：文件已从服务器永久删除",
+    "undoTypeNotSupported": "不支持撤销此类操作",
+    "undoOperationFailed": "撤销操作失败",
+    "unknownError": "未知错误",
+    "enterPath": "输入路径...",
+    "editPath": "编辑路径",
+    "confirm": "确认",
+    "cancel": "取消",
+    "folderName": "文件夹名",
+    "find": "查找...",
+    "replaceWith": "替换为...",
+    "startTyping": "开始输入...",
+    "fileSavedSuccessfully": "文件保存成功",
+    "autoSaveFailed": "自动保存失败",
+    "fileAutoSaved": "文件已自动保存",
+    "fileDownloadedSuccessfully": "文件下载成功",
+    "moveFileFailed": "移动 {{name}} 失败",
+    "moveOperationFailed": "移动操作失败",
+    "canOnlyCompareFiles": "只能对比两个文件",
+    "comparingFiles": "正在对比文件：{{file1}} 与 {{file2}}",
+    "dragFailed": "拖拽失败",
+    "filePinnedSuccessfully": "文件\"{{name}}\"已固定",
+    "pinFileFailed": "固定文件失败",
+    "fileUnpinnedSuccessfully": "文件\"{{name}}\"已取消固定",
+    "unpinFileFailed": "取消固定失败",
+    "shortcutAddedSuccessfully": "文件夹快捷方式\"{{name}}\"已添加",
+    "addShortcutFailed": "添加快捷方式失败",
+    "operationCompletedSuccessfully": "已{{operation}} {{count}} 个项目",
+    "operationCompleted": "已{{operation}} {{count}} 个项目",
+    "downloadFileSuccess": "文件 {{name}} 下载成功",
+    "downloadFileFailed": "下载失败"
   },
   "tunnels": {
     "title": "SSH 隧道",