refactor: address emmylua diagnostics

lua/git.lua

@@ -91,7 +91,8 @@ end
 ---@field worktree string
 ---@field buffers integer[]
 ---@field watcher? uv.uv_fs_event_t
----@field refresh fun() | ow.Util.Debouncer
+---@field refresh fun(self: ow.Git.Repo)
+---@field refresh_handle ow.Util.DebounceHandle
 local Repo = {}
 Repo.__index = Repo
 
@@ -101,13 +102,13 @@ function Repo:start_watcher()
         if err or (filename ~= "index" and filename ~= "HEAD") then
             return
         end
-        self.refresh()
+        self:refresh()
     end))
     self.watcher = watcher
 end
 
 function Repo:stop_watcher()
-    self.refresh:cancel()
+    self.refresh_handle.close()
     if self.watcher then
         self.watcher:stop()
         self.watcher:close()
@@ -179,9 +180,7 @@ function Repo.new(gitdir, worktree)
         worktree = worktree,
         buffers = {},
     }, Repo)
-    self.refresh = util.debounce(function()
-        do_refresh(self)
-    end, 50)
+    self.refresh, self.refresh_handle = util.debounce(do_refresh, 50)
     self:start_watcher()
     return self
 end
@@ -232,7 +231,7 @@ local function unregister(buf)
 end
 
 ---@param buf integer
-local function refresh(buf)
+local function refresh_buf(buf)
     if not vim.api.nvim_buf_is_valid(buf) or vim.bo[buf].buftype ~= "" then
         return
     end
@@ -241,7 +240,7 @@ local function refresh(buf)
         vim.b[buf].git_status = nil
         return
     end
-    repo.refresh()
+    repo:refresh()
 end
 
 local M = {}
@@ -260,7 +259,7 @@ function M.setup()
         {
             group = group,
             callback = function(args)
-                refresh(args.buf)
+                refresh_buf(args.buf)
             end,
         }
     )
@@ -273,7 +272,7 @@ function M.setup()
     vim.api.nvim_create_autocmd("FocusGained", {
         group = group,
         callback = function()
-            refresh(vim.api.nvim_get_current_buf())
+            refresh_buf(vim.api.nvim_get_current_buf())
         end,
     })
     vim.api.nvim_create_autocmd("VimLeavePre", {