fix: tool call anchor & wire format, streaming chunk passthrough, WebUI narrow-screen, docs bilingual

internal/lua/adapters/anthropic.lua

@@ -103,12 +103,41 @@ function adapter.transform_stream_chunk(raw_chunk)
     if chunk.type == "message_delta" then
         return json.encode({ content = "", done = (chunk.delta and chunk.delta.stop_reason ~= nil) })
     end
+    if chunk.type == "content_block_start" and chunk.content_block
+        and chunk.content_block.type == "tool_use" then
+        -- first fragment of a tool call: emit index + id + name, empty args
+        return json.encode({
+            content = "", done = false,
+            tool_calls = { {
+                index = chunk.index or 0,
+                id = chunk.content_block.id or "",
+                type = "function",
+                ["function"] = { name = chunk.content_block.name or "", arguments = "" }
+            } }
+        })
+    end
     if chunk.type == "content_block_delta" and chunk.delta then
+        if chunk.delta.type == "input_json_delta" then
+            -- incremental JSON fragment; clients accumulate across chunks
+            local unified = { content = "", done = false, tool_calls = { {
+                index = chunk.index or 0,
+                id = "",
+                type = "function",
+                ["function"] = { name = "", arguments = chunk.delta.partial_json or "" }
+            } } }
+            return json.encode(unified)
+        end
+        if chunk.delta.type == "thinking_delta" and chunk.delta.thinking then
+            return json.encode({ content = "", done = false, reasoning_content = chunk.delta.thinking })
+        end
         return json.encode({ content = chunk.delta.text or "", done = false })
     end
     if chunk.type == "message_stop" then
         return json.encode({ content = "", done = true })
     end
+    if chunk.type == "content_block_stop" then
+        return json.encode({ content = "", done = false })
+    end
     return ""
 end