Detect Storage Amount Available In OnboardingStorageAmount.qml page

[D33r-Gee]

Motivation

Based on the feedback by @GBKS in PR #397:

Can we detect how much space is available on each location and show it? And can we estimate the required space needed (the mock-up uses 500GB as a placeholder, which is meant to be replaced with something accurate).

Possible solution

add a variable (i.e. optionsModel.diskSpace) that checks storage amount in a specific location (i.e. local drive, mounted drive or directory)

Useful Skills

qml c++

Guidance for new contributors

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[GBKS]

To add some context, in the onboarding flow, we ask the user where to store block data. Especially on mobile, we want to make sure they have enough disk space available. So the UI should detect the available space, compare it to how much might be needed, and disable options that don't work.

[pablomartin4btc]

Just noticed this issue in #408 and checked this was identified already before creating a new one.

Regarding the wording... shouldn't say that the data "will be stored"?