fix(pam): give the rotation sub-pages a readable breadcrumb trail

[maxkpower]

Design review 2026-09-04: "it's not clear to me that these are breadcrumbs at all". A one-item trail with no separator reads as a caption. Same construction as the access-rule edit page, including not promoting the last crumb to the page heading.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.06%. Comparing base (a660080) to head (6398e0f).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...-web/src/app/pam/rotation/testing/story-helpers.ts	0.00%	5 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           pam/rotation-row-menus   #23007   +/-   ##
=======================================================
  Coverage                   56.06%   56.06%           
=======================================================
  Files                        4468     4469    +1     
  Lines                      143108   143113    +5     
  Branches                    22593    22593           
=======================================================
+ Hits                        80234    80237    +3     
- Misses                      57129    57133    +4     
+ Partials                     5745     5743    -2     

☔ View full report in Codecov by Harness.
📢 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.