feat: add gitcommit filetype for squash commit popup

lua/gitlab/actions/merge.lua

@@ -10,6 +10,7 @@ local M = {}
 local function create_squash_message_popup()
   return Popup(popup.create_popup_state({
     title = "Squash Commit Message",
+    filetype = "gitcommit",
     user_settings = state.settings.popup.squash_message,
   }))
 end

lua/gitlab/annotations.lua

@@ -427,6 +427,7 @@
 
 ---@class PopupOpts The options for customizing popup windows
 ---@field title string The string to appear on top of the popup
+---@field filetype? string The filetype of the popup (default: markdown)
 ---@field user_settings? table User-defined popup settings
 ---@field width? number Override default width
 ---@field height? number Override default height

lua/gitlab/popup.lua

@@ -6,10 +6,11 @@ local M = {}
 ---@param opts PopupOpts Options for customizing the popup
 ---@return table
 M.create_popup_state = function(opts)
+  opts = opts or { filetype = "markdown" }
   local settings = u.merge(require("gitlab.state").settings.popup, opts.user_settings or {})
   local view_opts = {
     buf_options = {
-      filetype = "markdown",
+      filetype = opts.filetype,
     },
     relative = "editor",
     enter = true,