1. Test legacy/new mode only upon logging out.
2. Avoid pulling all data unnecessarily:
* On startup: Retrieve list, current, and personal data.
* On refresh: Retrieve list and current data.
* On changing AB/switching tabs: Attempt to pull current data if not initialized.
3. Cache only personal and current AB.
4. Synchronize current AB from recent.
5. Remove AB loading CircularProgressIndicator.
Signed-off-by: 21pages <pages21@163.com>
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