Revert "refactor: message content (#1424)" (#1442)

This reverts commit ae8497faf1.

lua/avante/sidebar.lua

@@ -392,7 +392,6 @@ local function transform_result_content(selected_files, result_content, prev_fil
     elseif line_content == "<think>" then
       is_thinking = true
       last_think_tag_start_line = i
-      last_think_tag_end_line = 0
     elseif line_content == "</think>" then
       is_thinking = false
       last_think_tag_end_line = i
@@ -2357,7 +2356,6 @@ function Sidebar:create_input_container(opts)
       end
     end
 
-    ---@type AvanteLLMMessage[]
     local history_messages = {}
     for i = #chat_history, 1, -1 do
       local entry = chat_history[i]
@@ -2370,9 +2368,11 @@ function Sidebar:create_input_container(opts)
       then
         break
       end
-      local assistant_content = {}
-      table.insert(assistant_content, { type = "text", text = Utils.trim_think_content(entry.original_response) })
-      table.insert(history_messages, 1, { role = "assistant", content = assistant_content })
+      table.insert(
+        history_messages,
+        1,
+        { role = "assistant", content = Utils.trim_think_content(entry.original_response) }
+      )
       local user_content = ""
       if entry.selected_file ~= nil then
         user_content = user_content .. "SELECTED FILE: " .. entry.selected_file.filepath .. "\n\n"
@@ -2386,18 +2386,9 @@ function Sidebar:create_input_container(opts)
           .. "\n```\n\n"
       end
       user_content = user_content .. "USER PROMPT:\n\n" .. entry.request
-      table.insert(history_messages, 1, {
-        role = "user",
-        content = {
-          {
-            type = "text",
-            text = user_content,
-          },
-        },
-      })
+      table.insert(history_messages, 1, { role = "user", content = user_content })
     end
 
-    ---@type AvanteGeneratePromptsOptions
     return {
       ask = opts.ask or true,
       project_context = vim.json.encode(project_context),