UX improvements for theme browsing

[koopersmith]

After going through the themes pages with Jane, we've found a few points that need a bit of polish. I didn't want to lump them together with #19910, so now we have this ticket.

On Install Themes:

• Add action links: “Install now”, “Preview”.
• Move author under theme name.
• Figure out how to conceptually convey that users will be viewing both the preview and theme details.

On Manage Themes:

• Make delete link red and less clickable.
• Move version number to details.
• Move author under theme name.

[koopersmith]

Also, removing dead CSS and basic prettification.

[koopersmith]

In [20411]:

Remove CSS involving unused '.theme-listing' selector. see #20403.

[helenyhou]

Can we possibly bump up to 300px wide in the list table? Making the screenshots 300x225. With more details hidden seems like it could help it be more of a visual browsing experience. That change was going to be rolled in with multiple screenshots but 99.9% sure that will be punted.

[koopersmith]

Replying to helenyhou:

Can we possibly bump up to 300px wide in the list table? Making the screenshots 300x225.

Yes. That should happen regardless.

[koopersmith]

In [20412]:

Remove CSS involving unused '#theme-information' selector. see #20403.

[koopersmith]

In [20414]:

Theme browsing UX improvements. see #20403.

• On manage/install themes pages, moved author under theme name.
• On manage themes page, moved version number to details.

[koopersmith]

In [20415]:

Fix showing/hiding theme details and move code from theme-preview.js to theme.js. see #20403.

[koopersmith]

In [20426]:

Larger screenshots in theme list tables. see #20403, #19816.

[koopersmith]

In [20445]:

CSS improvements for the 'Current Theme' section. see #20403.

[koopersmith]

In [20446]:

Shrink theme screenshots for smaller screen resolutions. props helenyhou, see #20403.

[koopersmith]

In [20455]:

Theme list table style improvements. Make 'delete' link red and separate from other actions. New action separators. see #20403.

[koopersmith]

In [20458]:

Manage Themes: Improved separators (markup/styles) for current theme author/version. see #20403.

[koopersmith]

In [20459]:

Manage Themes: Improved separators (markup/styles) for current theme options menu. see #20403.

[koopersmith]

In [20514]:

RTL styles for theme browsing. props ocean90, fixes #20391, see #20403.

[koopersmith]

The only remaining issue is adding install now / preview / details links to the install themes page. Handing off to aaroncampbell for a patch.

[aaroncampbell]

Patch added

[koopersmith]

In [20716]:

Fix markup in wp-admin/themes.php. see #20403.

• Always print opening form tag.
• Always ensure table content clears to the next line. This prevents table content from bunching next to the 'Available Themes' headline, which occurred when only one theme was active on a multisite install.

[koopersmith]

In [20730]:

Add 'Install now', 'Preview', and 'Details' links to theme install list items. fixes #20403.

[ocean90]

[20730] needs RTL support, see #20626.