fix(database): bound large cell previews and use dialog editing (#1040)

Limit grid and export-preview cell text to 1000 UTF-16 code units plus an ellipsis. Edit large values in a wrapped dialog while preserving complete clipboard, export and database values.

Reproduced STATUS_STACK_OVERFLOW (0xC00000FD) in Windows WebView2 against a real PostgreSQL table with nine rows and 8.83 MB of jsonb data. Verified the fix through display, selection, editing, full clipboard copy, JSON file export and PostgreSQL writeback. All PR CI checks passed, including 5625 frontend tests and Rust checks on Windows, macOS and Linux.

Fixes #825

src/platform/locales/text/zh.json

@@ -1,4 +1,5 @@
 {
+  "Edit {name}": "编辑 {name}",
   "The language server JDK ({path}) must be a full JDK with jdk.compiler, jdk.jdi and jdk.unsupported for Java language support and debugging. jdtls needs JDK {version} or newer. Download JDK {version}, choose a full JDK in {setting}, or set it to Auto.": "语言服务器 JDK（{path}）必须是包含 jdk.compiler、jdk.jdi 和 jdk.unsupported 的完整 JDK，才能支持 Java 语言功能和调试。jdtls 需要 JDK {version} 或更高版本。请下载 JDK {version}，在 {setting} 中选择完整 JDK，或设为自动。",
   "Apple's clangd does not run clang-tidy, so checks from .clang-tidy are not shown. Install clangd (LLVM) to get them.": "Apple 的 clangd 不运行 clang-tidy，因此不会显示 .clang-tidy 中配置的检查。请安装 clangd（LLVM）以启用这些检查。",
   "Newer dependency version available": "有更新的依赖版本可用",