fix(agents-mobile): align session list ordering

[KyleAMathews]

Summary

• Filter principal entities out of the mobile sessions overview to match desktop.
• Keep mobile sessions explicitly sorted by updated_at descending after client-side filters.
• Align mobile status group ordering with desktop lifecycle ordering.

Testing

• git diff --check
• pnpm --filter @electric-ax/agents-mobile test: fails in this worktree before running tests because expo/tsconfig.base cannot be resolved.
• pnpm --filter @electric-ax/agents-mobile typecheck: fails in this worktree due missing/unresolved mobile dependencies/tsconfig, e.g. expo-router, react-native, expo/tsconfig.base, JSX config.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.41%. Comparing base (b2ddd59) to head (ec629ff).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4445   +/-   ##
=======================================
  Coverage   85.41%   85.41%           
=======================================
  Files           2        2           
  Lines          48       48           
  Branches       11       11           
=======================================
  Hits           41       41           
  Misses          7        7           

Flag	Coverage Δ
packages/agents-mobile	85.41% <ø> (ø)
typescript	85.41% <ø> (ø)
unit-tests	85.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[github-actions]

Electric Agents Mobile Build

Android preview build for commit ec629ff.

Platform	Profile	Status	Build
Android	preview	Passed	EAS build

Workflow run

[samwillis]

LGTM