feat(admin): surface API errors in admin store actions

[PierreBrisorgueil]

Summary

• Add error state to admin Pinia store, populated from API response messages in every catch block and cleared at the start of each action
• Display a closable v-alert in admin.view.vue when error is truthy
• Update store and view unit tests to cover error state initialization, setting, clearing, and API message extraction

Closes #3850

Scope

• Modules impacted: admin
• Cross-module impact: none
• Risk level: low

Test plan

• Lint passes (npm run lint)
• All 783 unit tests pass (npm run test:unit)
• CI green

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

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Run ID: 74c2a7a6-0053-482a-acfa-58c4b3b625a5

📥 Commits

Reviewing files that changed from the base of the PR and between 3a99e67 and 8cb0e6a.

📒 Files selected for processing (4)

• src/modules/admin/stores/admin.store.js
• src/modules/admin/tests/admin.store.unit.tests.js
• src/modules/admin/tests/admin.view.unit.tests.js
• src/modules/admin/views/admin.view.vue

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/3850-admin-error-state

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.23%. Comparing base (3a99e67) to head (8cb0e6a).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3861   +/-   ##
=======================================
  Coverage   99.23%   99.23%           
=======================================
  Files          28       28           
  Lines         910      920   +10     
  Branches      243      248    +5     
=======================================
+ Hits          903      913   +10     
  Misses          7        7           

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[Copilot]

Pull request overview

Adds user-visible error handling to the admin module by tracking API failures in the admin Pinia store and surfacing them in the main admin view.

Changes:

• Introduces error state in admin.store and sets/clears it in admin actions.
• Displays a closable error v-alert in admin.view.vue when the store error is present.
• Updates unit tests to validate store error initialization/setting/clearing behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
src/modules/admin/views/admin.view.vue	Renders a closable v-alert bound to the admin store’s error state.
src/modules/admin/tests/admin.view.unit.tests.js	Extends the admin store mock to include error (but does not add alert behavior assertions).
src/modules/admin/tests/admin.store.unit.tests.js	Adds expectations/tests around error initialization, setting, extraction from API message, and clearing between calls (for some actions).
src/modules/admin/stores/admin.store.js	Adds error to state and updates actions to clear/set it on failures.