Get media modal to play nice with P2 theme

[lessbloat]

There are a few places where we can improve styles for the front-end media modal in the P2 theme.

[nacin]

Note that some of this may simply be P2's problem. But, if there's anything we're doing that is fairly silly or lame, we should fix it. A few reset rules didn't hurt anyone.

[lessbloat]

22752.diff​ cleans up a few things:

• Removes a:hover border bottom
• Adjust layout of .link-to-custom field
• Adds some margin to the bottom of .post-upload-ui
• Fixes alignment for selected images (.selection-view)

The only thing that stood out to me that should get fixed in the theme is the add media button:

[lessbloat]

in 22752.2.diff:

• I removed border-bottom: none; for a:hover (Helenyhou brought down her fist ;-) - this will need to be done in the P2 theme)
• Removed the .link-to-custom style as it displays differently cross-browser
• Changed the magic number (23px) to something a little less magic (2em)

[helenyhou]

Just so I don't sound crazy, I brought down my fist because there is a line where we can't account for things, and it's best not to cross it. Where would it stop? All borders? Strikethrough? Background? Etc.

In any case, 22752.2.diff​ looks good to me. Doesn't seem to have adverse effects within the admin, either.

[nacin]

Let's bring back border-bottom: none, per IRC. Otherwise, .2.diff.

Also, the select elements are squished. Maybe we should also normalize those the way we do in the admin? (Do we?)

[lessbloat]

22752.3.diff:

• Adds border-bottom: none back in
• Attempts to fix select box formatting

[lessbloat]

Tightens up .link-to-custom (thanks Helenyhou)

[helenyhou]

22741.4.patch​ looks good to me.

[lessbloat]

2px padding for .media-frame select (instead of 3px)

[helenyhou]

Caught that select padding is actually 2px for the admin at large. .5 contains that little change.

[markjaquith]

I'm +1 on this. Leaving it for Nacin to commit when he wakes up since he had some opinions on it.

[nacin]

In 23077:

Media: Account for the most obvious and common style conflicts that may occur when the media modal is loaded on the frontend. Tested primarily with P2. props lessbloat, helenyhou. fixes #22752.

[nacin]

I moved border-bottom: none to .media-frame a, because that will handle overriding a :hover style (as it is a, not a:link).