Fixes for .flash padding, track description padding, footer collapsing

[ofsound]

Fixes #1109 Fixes #1104

Deploying requires a cache clear

Fixes an issue I've noticed on iPad where a flash message is the exact width of the screen, revealing the lack of padding.

Seems that extra padding ( actually a min-height ) of the user_description was also preserving the bottom alignment of the Track details and Listen and Favorite section within an accordion track.

I could maybe separate that section from the top down lay outing, and have it stuck to the bottom of that container rather than preserving a fixed distance below the date, or it could float a bit higher as it appears in the 2nd screenshot.

"Ready For Review" checklist

These checklists are to help ensure the code review basics are covered. Consider removing to reduce noise.

• [ ] PR title accurately summarizes changes
• [ ] New tests were added for isolated methods or new endpoints
• [ ] I opened an issue for any logical followups
• [ ] If this fixes a bug, "Fixes #XXX" is either the very first or very last line of the description.

Before code review and after additional commits during review.

• [ ] Update title and description to account for additional changes
• [ ] All tests green
• [ ] Migrations were tested locally and do the right thing
• [ ] Booted up the branch locally, exercised any new code
• [ ] Percy changes are purposeful or explained
• [ ] Css changes are happy on mobile (via Percy is ok)

[sudara]

I could maybe separate that section from the top down lay outing, and have it stuck to the bottom of that container rather than preserving a fixed distance below the date, or it could float a bit higher as it appears in the 2nd screenshot.

Yeah, I think that's a good idea if it's not too much of a pain. We should preserve the "View Track Detail" and the heart/play icon spacing with regards to the bottom of the container...