Improve suppressed diff boxes

[silverwind]

Some general improvements to the suppressed diff boxes:

• Made text fit on one line
• Added the "View file" button
• Added rounded borders around the box using a new CSS helper class
• Fixed an unclear issue with the diff bars where they would not render the green part

Before

After

[codecov-io]

Codecov Report

Merging #3193 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3193      +/-   ##
==========================================
+ Coverage   34.71%   34.71%   +<.01%     
==========================================
  Files         276      276              
  Lines       39975    39975              
==========================================
+ Hits        13877    13879       +2     
+ Misses      24103    24102       -1     
+ Partials     1995     1994       -1

Impacted Files	Coverage Δ
models/repo_indexer.go	51.94% <0%> (-1.95%)	⬇️
models/repo.go	41.47% <0%> (+0.18%)	⬆️
modules/process/manager.go	81.15% <0%> (+4.34%)	⬆️

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[ethantkoenig]

LGTM

[lafriks]

LGTM