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]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

Name	Link
🔨 Latest commit	9e287a1
🔍 Latest deploy log	https://app.netlify.com/projects/endearing-brigadeiros-63f9d0/deploys/69aa8ef6593dd00008711a5d

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.01%. Comparing base (ac353de) to head (9e287a1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1446   +/-   ##
=======================================
  Coverage   90.01%   90.01%           
=======================================
  Files          67       67           
  Lines        4769     4769           
  Branches      885      885           
=======================================
  Hits         4293     4293           
  Misses        458      458           
  Partials       18       18           

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.