Fleet UI: Add self-service categories to command palette

[RachelElysia]

Issue

Closes #43757
Closes #46443

Description

• Adds two entries: a "Self-service categories" sub-item under Software library for navigation, and an "Add self-service category" action that deep-links the page with ?add_category=1 to auto-open the modal (mirroring the Variables/Scripts pattern).

Screenrecording

Uploading Screen Recording 2026-06-08 at 1.41.41 PM.mov…

Testing

• Added/updated automated tests
• QA'd all new/changed functionality manually

[RachelElysia]

@claude review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.17%. Comparing base (b23f808) to head (f3a70c7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #47115    +/-   ##
========================================
  Coverage   67.17%   67.17%            
========================================
  Files        2908     2908            
  Lines      226136   226142     +6     
  Branches    11829    11684   -145     
========================================
+ Hits       151898   151904     +6     
- Misses      60508    60509     +1     
+ Partials    13730    13729     -1     

Flag	Coverage Δ
frontend	57.65% <100.00%> (+<0.01%)	⬆️

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[Copilot]

Pull request overview

This PR extends Fleet’s global command palette (⌘/Ctrl+K) to better support the self-service software categories workflow by adding (1) a navigation entry to the categories page and (2) a deep-link “Add” action that auto-opens the “Add category” modal via a query param, matching the existing Variables/Scripts deep-link pattern.

Changes:

• Add a “Self-service categories” sub-item under “Software library” in the command palette.
• Add an “Add self-service category” command that links to /software/library/categories?add_category=1 (with fleet context preserved).
• Update the SelfServiceCategories page to open (and then strip) the add_category=1 param and add automated tests for the deep-link behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
frontend/pages/SoftwarePage/SoftwareLibrary/SelfServiceCategoriesPage/SelfServiceCategoriesPage.tsx	Adds deep-link handling (?add_category=1) to open the Add modal (permission-gated) and then strips the param via router.replace.
frontend/pages/SoftwarePage/SoftwareLibrary/SelfServiceCategoriesPage/SelfServiceCategoriesPage.tests.tsx	Adds test coverage for the deep-link modal open/strip behavior (manager vs non-manager and re-open scenarios).
frontend/components/CommandPalette/helpers.tests.ts	Updates palette helper tests to assert the new command ID is present/absent under the correct permission conditions.
frontend/components/CommandPalette/groups/software.ts	Adds “Self-service categories” as a sub-item under “Software library” for navigation.
frontend/components/CommandPalette/groups/commands.ts	Adds “Add self-service category” command that deep-links with ?add_category=1 and preserves fleet context via withTeamId.

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