responsive fixes for chat

[androolloyd]

Description

CSS updates to provider a more responsive wrapper, originally was going to get the permission work added in but after reviewing and looking at @owocki's comments around usage for templates etc, changing to permissions in this release would be too rushed so it was held back.

Refers/Fixes

#5522 1.1 ticketing notes.

[codecov]

Codecov Report

Merging #5587 into master will increase coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5587      +/-   ##
==========================================
+ Coverage   30.26%   30.74%   +0.48%     
==========================================
  Files         247      247              
  Lines       21143    22704    +1561     
  Branches     3060     3593     +533     
==========================================
+ Hits         6398     6981     +583     
- Misses      14469    15394     +925     
- Partials      276      329      +53

Impacted Files	Coverage Δ
app/app/urls.py	89.65% <0%> (-0.55%)	⬇️
app/dashboard/helpers.py	14.1% <0%> (-0.51%)	⬇️
...rketing/management/commands/no_applicants_email.py	0% <0%> (ø)	⬆️
app/grants/views.py	15.55% <0%> (+0.11%)	⬆️
app/dashboard/views.py	14.97% <0%> (+2.08%)	⬆️
app/dashboard/models.py	58.78% <0%> (+2.51%)	⬆️
app/dashboard/admin.py	69.88% <0%> (+6.04%)	⬆️

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