AaaLD - article content interstitial design polish

[tonisevener]

Fixes Phabricator ticket:
https://phabricator.wikimedia.org/T265666
https://phabricator.wikimedia.org/T265669

Notes

• Open up article you've never seen on EN Wikipedia in LTR mode on device.
• Look at timestamp next to the New Changes badge.
• Now pull to refresh, confirm new changes badge switches to Last Updated and timestamp looks the same (it was different in some cases before)
• Confirm you don't see any bugs on the article interstitial (colors and spacing were tweaked). Test all themes.
• Button background colors on View Changes / View Discussion / Thank buttons in modal slightly changed, confirm that looks alright (note Carolyn still wants to rethink the Thank selected state).

[mcleinman]

Great tweaks overall. A few questions/comments.

When playing with text sizes, I found another bug. Feel free to fix it here, or spin it out into its own Phab ticket (and assign to me if you want - it's likely a bug I didn't find before, almost definitely not something you introduced).

• The AaaLD modal uses the device's text size. At the largest (non-accessibility) text size and the smallest text size, open the AaaLD modal. (I didn't check on large accessibility sizes.)
• Note that the scrollview is scrolled all the way to the bottom - instead of the top, as expected. Also, the navbar underbar view is showing.
• I'm unclear if this is a bug in the navbar, the auto-scrolling (which shouldn't be happening in this situation), or something else. But I'd be happy to dig in if you'd like.

[mcleinman]

Working great, thanks!

[mcleinman]

Great tweaks overall. A few questions/comments.

When playing with text sizes, I found another bug. Feel free to fix it here, or spin it out into its own Phab ticket (and assign to me if you want - it's likely a bug I didn't find before, almost definitely not something you introduced).

* The AaaLD modal uses the device's text size. At the largest (non-accessibility) text size and the smallest text size, open the AaaLD modal. (I didn't check on large accessibility sizes.)

* Note that the scrollview is scrolled all the way to the bottom - instead of the top, as expected. Also, the navbar underbar view is showing.

* I'm unclear if this is a bug in the navbar, the auto-scrolling (which shouldn't be happening in this situation), or something else. But I'd be happy to dig in if you'd like.

Phab ticket for this bug: https://phabricator.wikimedia.org/T266621