Fix/import export hacks

[TheLastProject]

Keeps screen on import/export activity to prevent getting killing in background (fixes #1978)
Also cancels import/export when tapping next to the progress dialog (fixes #1980)

@Korb I don't have a big enough export file to test either of these (the imports/exports finish way too fast for me). Could you please test this? I've attached a debug build (but feel free to build from this commit yourself too if you'd rather do that): app-debug.zip

[Korb]

@TheLastProject, I tested importing and exporting a large collection of cards using your build.

✅ The import/export operation aborts without prompting when you tap on the screen outside of the import or export process notification.
✅ The screen does not turn off during import and export.
✅ The screen does not go blank when the import/export success notification is displayed on the screen.

OS version: Funtouch OS 14
Model: Vivo T1 4G (V2153)
Hardware version: MP_0.1
Build number: PD22010F_EX_A_14.2.7.12.W20
Baseband version: S.HA.1.1.c2-00054-DIVAR_GENSP_PACK-1.29062.88
Kernel version: 4.19.157-perf+, 1 Wed Jun 5 10:25:33 CST 2024
Compile time: 5 Jun 2024 05:20:41
Android security update: 1 June 2024

[TheLastProject]

Thanks for confirming!