975 improve iphone launch sequence new

[BPerlakiH]

Fixes: #975

Re-opening from: #976

What had to be changed:

• Changed the logo assets
• Changed the order of the category tabs on iPhone, in order to make the opening animation smooth (from: "opened, categories, downloads, new" to: "categories, new, downloads, opened")
• In terms of the splash screen, since we cannot localise the message, and it's not recommended by Apple to include any text on it:

Avoid including text on your launch screen, even if your first screen displays text. Because the content in a launch screen doesn’t change, any text you display won’t be localized.

• For this reason, I removed the text from the splash screen, we do have it on the loading screen though. Another reason, is that the button and text position is calculated on the rendered image size, which is not possible on the splash screen.
• Slight update is needed on the custom apps side, we need to add the original image width / height, as swiftui is not giving us these values (at least I haven't found a way to do that).
  This extra overhead with the original image size (and any change on the custom app side) can be avoided if we position the buttons (and loading text) relative to the screen height. The only difference will be that the space between the Logo and the buttons (and loading text) will be smaller or larger depending on the screen size.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.32653% with 58 lines in your changes missing coverage. Please review.

Project coverage is 39.86%. Comparing base (1f28cbd) to head (43f104e).

Files with missing lines	Patch %	Lines
App/SplitViewController.swift	10.52%	17 Missing ⚠️
Views/BuildingBlocks/LoadingView.swift	80.45%	17 Missing ⚠️
Views/Welcome.swift	86.07%	11 Missing ⚠️
App/CompactViewController.swift	60.86%	9 Missing ⚠️
Views/Library/Library.swift	66.66%	2 Missing ⚠️
Views/Library/ZimFilesCategories.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1000      +/-   ##
==========================================
- Coverage   40.00%   39.86%   -0.15%     
==========================================
  Files         114      116       +2     
  Lines        6472     6618     +146     
==========================================
+ Hits         2589     2638      +49     
- Misses       3883     3980      +97     

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[BPerlakiH]

Previews:

iPhone:

iphone_light.mov

iphone_post_inst_dark.mov

iPad:

ipad_first_inst_light.mov

macOS:

mac_os.mov

[kelson42]

@BPerlakiH After a first look, looks good modulo:

• The logo+buttons block is not centered vertically properly
• iphone_post_inst_dark.mov has still a spinner where we have said we son't have spinner there

[BPerlakiH]

@kelson42 I have updated so that the whole logo + button block is now vertically centered.

ipad.mov

iphone_light.mov

iphone_land_dark.mov

[kelson42]

@BPerlakiH What about the spinner?

[BPerlakiH]

@kelson42 That's seems to be good, the former recording was a post install (2nd time app launch) sequence, as you can see on the new screen recording, first time users won't have the spinner.