Installer crashes when sideloading progress goes over 100%

[SirRGB]

Describe the bug
When flashing Magisk the installer gets stuck.
Device seems to reboot into recovery.

To Reproduce
Steps to reproduce the behavior:
Install Magisk-v26.4.zip (renamed from apk) as addon.

Expected behavior
Flashing succeeds and you can continue.
Im fine with a disclaimer too since Magisk is not meant for the target audience of oai.

Log file
https://haste.aicp-rom.com/ujemuyewoq.sql

Screenshots

Desktop (please complete the following information):

• OS: Tuxedo OS 2, i.e. Kubuntu 22.04 LTS

Smartphone (please complete the following information):

• Device: OnePlus 5
• OS: crDroid 9.11
• OAI Version 0.51

Additional context

Manually sideloading causes >100% progress, which crashes the progress bar in oai.

It may be related to #256, because it was working when I tested my PR (#222 for example)
However, adb's status progress was above 100%, so was OAI status bar too, but Magisk was installed correctly.

[tsterbak]

It may be related to #256, because it was working when I tested my PR (#222 for example)

Yeah, I guess the issue with the progressbar was introduced here... I will fix it with the next release.

Install Magisk-v26.4.zip (renamed from apk) as addon.

Maybe we should also allow for apk sideloading? Do you see any downsides there?

[SirRGB]

I was able to flash the Magisk apk successfully using the dev branch, so consider this fixed.
Im not quite sure if we should allow apk sideloading in general since the Magisk apk is basically the only apk, that behaves like a zip as far as I know. Maybe allow .zip and Magisk.apk? Sideloading an unsupported apk just throws an error in the recovery...