feat(agents-mobile): Add agent signal controls

[samwillis]

Summary

• Add mobile agent signal support, including stop controls in the composer and a signal submenu in the session menu.
• Pass composer/drawer inset into the embedded chat log so timeline content scrolls behind the native controls.
• Align mobile embedded chat message widths and fade masking with the native composer layout.

Test plan

• pnpm --filter @electric-ax/agents-mobile typecheck
• pnpm --filter @electric-ax/agents-server-ui typecheck
• ReadLints on recently edited files

Made with Cursor

[github-actions]

Electric Agents Desktop Builds

Build artifacts for commit a91668b.

Platform	Status	Artifact
macOS Apple Silicon	Passed	DMG
macOS Intel	Passed	DMG
Windows x64	Passed	Installer
Linux x64	Passed	AppImage / deb

Workflow run

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.53%. Comparing base (e13cad1) to head (a91668b).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/agents-server-ui/src/embed/EmbedApp.tsx	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (e13cad1) and HEAD (a91668b). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (e13cad1)	HEAD (a91668b)
unit-tests	5	2
typescript	5	2
packages/agents	1	0
packages/electric-ax	1	0
packages/agents-runtime	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4391       +/-   ##
===========================================
- Coverage   55.88%   35.53%   -20.36%     
===========================================
  Files         259      184       -75     
  Lines       26865    13528    -13337     
  Branches     7434     4566     -2868     
===========================================
- Hits        15014     4807    -10207     
+ Misses      11836     8707     -3129     
+ Partials       15       14        -1     

Flag	Coverage Δ
packages/agents	?
packages/agents-runtime	?
packages/agents-server	74.44% <ø> (ø)
packages/agents-server-ui	6.23% <0.00%> (-0.01%)	⬇️
packages/electric-ax	?
typescript	35.53% <0.00%> (-20.36%)	⬇️
unit-tests	35.53% <0.00%> (-20.36%)	⬇️

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