Update keymap for Git files in quickfix list

Changed keymap from `<leader>gf` to `<leader>gg` for sending modified,
deleted, and untracked Git files to the quickfix list. Added utility
function to handle Git status parsing.

lua/utils.lua

@@ -17,6 +17,57 @@ M.tabline_full_parents = 1
 -- Example: with shorten_length = 1, /path/to/my becomes p/t/m
 M.tabline_shorten_length = 3
 
+-- Get all modified, deleted, and untracked Git files with status
+-- Returns a list suitable for setqflist() or nil on error
+function M.git_changed_files()
+  -- Use git status --porcelain to get all changes with status indicators
+  -- Format: "XY filename" where X=index status, Y=worktree status
+  -- Status codes: M=modified, D=deleted, A=added, ??=untracked, etc.
+  local handle = io.popen('git status --porcelain 2>/dev/null')
+  if not handle then
+    vim.notify('Failed to run git status', vim.log.levels.ERROR)
+    return nil
+  end
+  
+  local result = handle:read('*a')
+  handle:close()
+  
+  if result == '' then
+    vim.notify('No git changes found', vim.log.levels.INFO)
+    return nil
+  end
+  
+  local qf_list = {}
+  local status_map = {
+    ['M'] = 'Modified',
+    ['A'] = 'Added',
+    ['D'] = 'Deleted',
+    ['R'] = 'Renamed',
+    ['C'] = 'Copied',
+    ['U'] = 'Unmerged',
+    ['?'] = 'Untracked',
+  }
+  
+  for line in result:gmatch('[^\n]+') do
+    -- Parse porcelain format: "XY filename" or "XY original -> renamed"
+    local index_status = line:sub(1, 1)
+    local work_status = line:sub(2, 2)
+    local filename = line:sub(4) -- Skip "XY " prefix
+    
+    -- Determine status text (worktree takes precedence over index)
+    local status_code = work_status ~= ' ' and work_status or index_status
+    local status_text = status_map[status_code] or 'Changed'
+    
+    table.insert(qf_list, {
+      filename = filename,
+      lnum = 1,
+      text = status_text,
+    })
+  end
+  
+  return qf_list
+end
+
 -- Custom tabline function
 -- Shows configurable number of full parent directories, shortens the rest
 function M.custom_tabline()