feat: turn delimiter, no default hl_group for chat

Author: gsuuon

lua/model/core/chat.lua

@@ -300,6 +300,8 @@ function M.run_chat(opts)
     seg = segment.create_segment_at(#buf_lines - 1, #buf_lines[#buf_lines])
   end
 
+  seg.clear_hl()
+
   local sayer = juice.sayer()
 
   ---@type StreamHandlers

lua/model/util/segment.lua

@@ -203,6 +203,7 @@ local function create_segment_at(row, col, bufnr, hl_group, join_undo)
     clear_hl = vim.schedule_wrap(function()
       local mark = get_details()
 
+      _hl_group = nil
       mark.details.hl_group = nil
       mark.details.id = _ext_id
 

queries/mchat/highlights.scm

@@ -1,3 +1,4 @@
 (chat_handler) @type
 (system_instruction) @attribute
 (reason_delimiter) @punctuation.delimiter
+(turn_delimiter) @punctuation.delimiter