create highlight group for filename in finder grep

lua/plugins/finder.lua

@@ -245,10 +245,29 @@ local function render()
   vim.api.nvim_buf_set_lines(S.buf_res, 0, -1, false, view)
   vim.api.nvim_buf_clear_namespace(S.buf_res, S.ns, 0, -1)
 
-  -- match highlights
+  -- highlight groups
   vim.api.nvim_set_hl(0, 'FinderMatch', { link = 'Search', default = true })
+  vim.api.nvim_set_hl(0, 'FinderPath', { fg = '#888888', default = true })
+
   for i = 1, #view do
     local idx = S.scroll + i
+    local line = view[i]
+
+    -- In grep mode, highlight the "file:line:col:" prefix in gray
+    if S.mode == 'grep' and line then
+      local prefix_end = line:find('^.-:%d+:%d+:')
+      if prefix_end then
+        local _, epos = line:find('^.-:%d+:%d+:')
+        if epos then
+          pcall(vim.api.nvim_buf_set_extmark, S.buf_res, S.ns, i - 1, 0, {
+            end_col = epos,
+            hl_group = 'FinderPath',
+          })
+        end
+      end
+    end
+
+    -- match highlights (query matches in orange)
     local spans = S.positions[idx]
     if spans then
       for _, se in ipairs(spans) do