manager: Fix save log (#2170)

https://github.com/user-attachments/assets/69467e00-0af9-4d46-add8-e24e767462bd

Use `ContextCompat` in `DownloadListener`
Bump ksp to `2.0.21-1.0.26`
Misc changes (See the
[commit](https://github.com/tiann/KernelSU/commit/1fb49d918a1f5bb76d1e70eb848ede36b2292cd9)
directly)

manager/app/src/main/res/values-zh-rCN/strings.xml

@@ -130,4 +130,5 @@
     <string name="flash_failed">刷写失败</string>
     <string name="selected_lkm">选择的 LKM ：%s</string>
     <string name="save_log">保存日志</string>
+    <string name="log_saved">日志已保存</string>
 </resources>

manager/app/src/main/res/values/strings.xml

@@ -132,4 +132,5 @@
     <string name="flash_failed">Flash failed</string>
     <string name="selected_lkm">Selected LKM: %s</string>
     <string name="save_log">Save logs</string>
+    <string name="log_saved">Logs saved</string>
 </resources>