feat: Add action summary to push view

[andypols]

Summary

It can be hard to understand why a push was rejected. This PR adds a view of each step involved in a push, making it easier to identify failures. It also fixes #1387 and prevents the UI from crashing when a push fails before a diff is generated.

We use "steps" instead of actions in the UI, since “actions” was confusing for users.

Solution

• Introduces a tabbed view for push data, including Commits, Diff, and Steps. This reduces scrolling and provides a foundation for future additions, such as an AI-generated change summary (future PR).

• Adds dedicated components for each tab.
• Extended CustomTabs to support an optional badge.
• Calculates the total error count across steps and displays it as a badge to make failures more visible.
• Sums the error count from the steps and displays an error count as a badge to highlight there are errors.
• Adds a StepsTimeline component featuring an accordion layout, status chips, and log output to better surface errors, blocked steps, and successful execution.

• Clicking on an accordion step the info about that action

• Prevents large step payloads from being rendered.

[netlify]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.66%. Comparing base (232980a) to head (01c544f).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1446   +/-   ##
=======================================
  Coverage   89.66%   89.66%           
=======================================
  Files          68       68           
  Lines        4869     4869           
  Branches      888      888           
=======================================
  Hits         4366     4366           
  Misses        485      485           
  Partials       18       18           

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[re-vlad]

lets couple of non-blocking suggestions

[jescalada]

Fantastic contribution @andypols! 🚀 This is super useful for debugging pushes that errored out without having to dig through logs. The latest logging enhancements should help improve this further!

I'd just like to double-check that everything being logged is appropriate for the user to see, and that the recently added step.logs aren't excessive (otherwise we might want to add them to isLargeStep).

[jescalada]

LGTM! Might have to wait for #1482 to get merged first so that the CI passes as expected.