Populate sidebar labels on first paint with full default i18n table

The I18N defaults object only carried ~9 short-alias keys, so every
data-i18n sidebar label (think level, system prompt, temperature, max
tokens, top-p, preserved thinking, functions, validate, etc.) stayed
blank until /config round-tripped — and if /config failed they never
appeared at all. Bake the full English table into the frontend so all
labels render immediately; /config then overrides with the active
locale (en/zh).

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

static/index.html

@@ -606,17 +606,55 @@ import { Client } from "https://cdn.jsdelivr.net/npm/@gradio/client@1.7.1/dist/i
   "use strict";
 
   // ─── i18n + examples (loaded from /config endpoint) ──────────────
+  // Full English default table so every label is populated on first paint
+  // — before /config round-trips. /config then overrides with the active
+  // locale (en/zh). Keep these in sync with i18n.py.
   const I18N = {
-    examples_heading: "What can I help you with?",
-    msg_placeholder: "Type a message...",
-    thinking: "Thinking...",
-    thinking_done: "Thinking complete",
-    code_copy: "Copy",
-    code_copied: "Copied",
-    model_busy: "Model is still responding. Please wait for it to finish before sending a new message.",
-    empty_msg: "Please enter a message",
-    request_failed: "Request failed, please retry or adjust parameters",
-    new_chat: "Start a new chat",
+    "title": "Hy3 Chat Demo",
+    "title.notice_html": "The current demo version is offline; full-featured capabilities will be available on the Tencent HY official website.",
+    "examples_heading": "What can I help you with?",
+    "msg_placeholder": "Type a message...",
+    "sidebar.think_level": "Think level",
+    "sidebar.think_level.info": "Control reasoning depth",
+    "sidebar.system_prompt": "System prompt",
+    "sidebar.system_prompt.placeholder": "You are a helpful AI assistant...",
+    "sidebar.temperature": "Temperature",
+    "sidebar.temperature.info": "Higher values produce more random outputs",
+    "sidebar.temperature.use_default": "Use model default",
+    "sidebar.max_tokens": "Max output tokens",
+    "sidebar.max_tokens.info": "Maximum tokens per response. Set to 0 to use the model's default.",
+    "sidebar.top_p": "Top P",
+    "sidebar.top_p.info": "Nucleus sampling probability threshold. Set to 0 to use the model's default.",
+    "sidebar.preserved_thinking": "Preserved thinking",
+    "sidebar.preserved_thinking.info": "When enabled, the model can retain reasoning content from previous assistant turns in the context, helping maintain reasoning continuity and conversation integrity while improving model performance.",
+    "sidebar.preserved_thinking.use_default": "Preserved thinking — Use model default",
+    "sidebar.preserved_thinking.use_default.info": "We recommend using \"Use model default\", which automatically enables this option for tool call workflows and disables it for pure text conversations.",
+    "sidebar.functions": "🔧 Functions",
+    "sidebar.functions.label": "Function definitions (JSON array)",
+    "sidebar.validate_btn": "Validate & Format",
+    "tool.result_label": "Function result",
+    "tool.result_placeholder": "Enter function return value... (Enter to submit)",
+    "tool.submit": "Submit",
+    "tool.call_header": "Function call ({i}/{n})",
+    "tool.call_label": "🔧 Call function",
+    "display.thinking": "Thinking...",
+    "display.thinking_done": "Thinking complete",
+    "display.code_copy": "Copy",
+    "display.code_copied": "Copied",
+    "warn.empty_msg": "Please enter a message",
+    "warn.invalid_fn_json": "Invalid function JSON, please fix or clear before sending: {err}",
+    "warn.request_failed": "Request failed, please retry or adjust parameters",
+    "warn.model_busy": "Model is still responding. Please wait for it to finish before sending a new message.",
+    "info.new_chat": "Start a new chat",
+    // short aliases used directly in code below
+    "thinking": "Thinking...",
+    "thinking_done": "Thinking complete",
+    "code_copy": "Copy",
+    "code_copied": "Copied",
+    "model_busy": "Model is still responding. Please wait for it to finish before sending a new message.",
+    "empty_msg": "Please enter a message",
+    "request_failed": "Request failed, please retry or adjust parameters",
+    "new_chat": "Start a new chat",
   };
   let EXAMPLES = [];
   let TOOL_CALL_LABEL = "🔧 Call function";