Update Send button bg color

[americanrefugee]

Change the gradient bg to accent/rest.

We talked about killing the accent button generally, but the Send button currently has a gradient bg - which looks out of place with the rest of the app. @amshakal do you agree with this?

Pull Request Checklist

• I read the contributing guide.
• Pull request contains a changelog label.

UI changes have been tested with:

• iPhone and iPad simulators in portrait and landscape orientations.
• Dark mode enabled and disabled.
• Various sizes of dynamic type.
• Voiceover enabled.

[amshakal]

It's not wrong. It does look out of place.

[pixlwave]

Noting that this is blocked for now as the send button should also be styled with Liquid Glass on iOS 26

[codecov]

Codecov Report

❌ Patch coverage is 93.47826% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.67%. Comparing base (81a5e3c) to head (605d4ae).
⚠️ Report is 3 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...mScreen/ComposerToolbar/View/ComposerToolbar.swift	89.18%	4 Missing ⚠️
...ineItemViews/HighlightedTimelineItemModifier.swift	0.00%	1 Missing ⚠️
...X/Sources/Screens/Timeline/View/TimelineView.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5170   +/-   ##
========================================
  Coverage    74.67%   74.67%           
========================================
  Files          787      787           
  Lines        52559    52545   -14     
========================================
- Hits         39246    39240    -6     
+ Misses       13313    13305    -8     

Flag	Coverage Δ
unittests	64.59% <93.47%> (-0.03%)	⬇️

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