fix(app): eliminate startup white screen by replacing @iarna/toml with browser-friendly smol-toml

- chore(deps): switch TOML dependency from @iarna/toml to smol-toml and update lockfile
- feat(mcp): add TOML editing/validation for Codex while keeping JSON for Claude; support auto ID extraction from TOML and JSON->TOML conversion for wizard output; add pre-submit required checks (stdio.command / http.url)
- refactor(mcp): unify JSON/TOML validation errors via i18n; add formatTomlError for consistent, localized messages; consolidate state into formConfig/configError
- feat(i18n): add TOML labels/placeholders and error keys (tomlConfig, tomlPlaceholder, tomlInvalid)
- feat(utils): introduce tomlUtils with parse/stringify/validate/convert helpers using smol-toml; provide tomlToMcpServer, mcpServerToToml, extractIdFromToml, validateToml
- build: confirm Vite no longer externalizes Node builtins during build; renderer builds without 'Module 'stream' has been externalized' warning

src/i18n/locales/en.json

@@ -285,6 +285,8 @@
       "descriptionPlaceholder": "Optional description",
       "jsonConfig": "JSON Configuration",
       "jsonPlaceholder": "{\n  \"type\": \"stdio\",\n  \"command\": \"uvx\",\n  \"args\": [\"mcp-server-fetch\"]\n}",
+      "tomlConfig": "TOML Configuration",
+      "tomlPlaceholder": "type = \"stdio\"\ncommand = \"uvx\"\nargs = [\"mcp-server-fetch\"]",
       "useWizard": "Config Wizard"
     },
     "wizard": {
@@ -328,6 +330,7 @@
       "idRequired": "Please enter identifier",
       "idExists": "Identifier already exists. Please choose another.",
       "jsonInvalid": "Invalid JSON format",
+      "tomlInvalid": "Invalid TOML format",
       "commandRequired": "Please enter command",
       "singleServerObjectRequired": "Please paste a single MCP server object (do not include top-level mcpServers)",
       "saveFailed": "Save failed",

src/i18n/locales/zh.json

@@ -285,6 +285,8 @@
       "descriptionPlaceholder": "可选的描述信息",
       "jsonConfig": "JSON 配置",
       "jsonPlaceholder": "{\n  \"type\": \"stdio\",\n  \"command\": \"uvx\",\n  \"args\": [\"mcp-server-fetch\"]\n}",
+      "tomlConfig": "TOML 配置",
+      "tomlPlaceholder": "type = \"stdio\"\ncommand = \"uvx\"\nargs = [\"mcp-server-fetch\"]",
       "useWizard": "配置向导"
     },
     "wizard": {
@@ -328,6 +330,7 @@
       "idRequired": "请填写标识",
       "idExists": "该标识已存在，请更换",
       "jsonInvalid": "JSON 格式错误，请检查",
+      "tomlInvalid": "TOML 格式错误，请检查",
       "commandRequired": "请填写命令",
       "singleServerObjectRequired": "此处只需单个服务器对象，请不要粘贴包含 mcpServers 的整份配置",
       "saveFailed": "保存失败",