Use block rather than card css rule for card component

[mouse-reeve]

Description

This removes a lot of lines, shadows, and whitespace from statuses in the feed.

After this change:

Current feed:

• Related Issue Visual refresh #3770
• Closes #

What type of Pull Request is this?

• Bug Fix
• Enhancement
• Plumbing / Internals / Dependencies
• Refactor

Does this PR change settings or dependencies, or break something?

• This PR changes or adds default settings, configuration, or .env values
• This PR changes or adds dependencies
• This PR introduces other breaking changes

Details of breaking or configuration changes (if any of above checked)

Documentation

• New or amended documentation will be required if this PR is merged
• I have created a matching pull request in the Documentation repository
• I intend to create a matching pull request in the Documentation repository after this PR is merged

Tests

• My changes do not need new tests
• All tests I have added are passing
• I have written tests but need help to make them pass
• I have not written tests and need help to write them

[mouse-reeve]

Updated to reflect feedback that the division between statuses was too hard to see:

[j6k4m8]

I like the new look and definitely agree it needs the clearer delineation in the update!!
I think also possibly left/right borders could help to ground it as well, I'm looking at the current bluesky and masto designs as inspiration:

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[maxheadroom]

Mmh, I have to admit I like the old layout better. For this old layout is a clearer distinction between the two posts as one can see where the posts ends.