1. update version to 5.2.1 in changelog and package.json
2. add real-time upload progress display in submission window
3. optimize icon filename display and form reset logic
4. add success modal after successful submission
5. improve logging formatting in submitter backend
1. add shell caller ssupdate command support
2. add pre-update system refresh for update center
3. add get-git-email IPC handler and auto-fill email
4. optimize deb submission UI and category handling
5. disable and auto-fill package name/version fields
6. add loading and error states for category list
7. fix category value matching for history data
shenmo7192
gfdgd-xi