Migrate first admin mailer and navigation views to ERB

[mfo]

Summary

• add missing view specs for admin pagination, mailers, and navigation components to support snapshotting
• capture baseline HTML snapshots with deterministic filenames for the migrated views
• convert the first batch of HAML templates (admin alerts, pagination, admin mailers, and navigation partials) to ERB while preserving layout and helpers

Testing

• bundle exec herb analyze . (fails: herb analyze raises "negative argument" inside Herb::Project#progress_bar)
• bin/rake lint (fails: bun lint:herb cannot find the herb-lint executable)
• bundle exec rspec spec/views (fails: many legacy view specs depend on asset pipeline artefacts such as pictograms and fail without them)

---

https://chatgpt.com/codex/tasks/task_e_68c90957c8388321aac532ec9c9102f8

[Copilot]

Pull Request Overview

This PR migrates the first batch of HAML templates to ERB format while preserving layout and helpers, alongside adding comprehensive view specs with baseline HTML snapshots for the converted templates.

• Convert admin alert, navigation, and mailer views from HAML to ERB
• Add missing view specs for pagination, mailers, and navigation components
• Generate deterministic HTML snapshots to support future comparison testing

Reviewed Changes

Copilot reviewed 43 out of 47 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
app/views/administrateurs/_*.html.{haml,erb}	Convert navigation, breadcrumbs, login banner, and groups header partials from HAML to ERB
app/views/administrateur_mailer/*.html.{haml,erb}	Migrate mailer templates for service notifications, API token expiration, and account activation
app/views/administrate/application/_pagination.html.{haml,erb}	Convert pagination partial from HAML to ERB
app/views/admin/_closed_mail_template_attestation_inconsistency_alert.html.{haml,erb}	Migrate alert template from HAML to ERB
spec/views/**/*_spec.rb	Add comprehensive view specs for all migrated templates
spec/views/**/*.html	Generate baseline HTML snapshots for regression testing

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

The alert_classes variable is defined and used only once. Consider inlining this logic directly in the class attribute: <div class=\"alert <%= flash_class('alert') %>\">

[Copilot]

Duplicated logic for building alert classes. This is repeated from lines 4-5. Consider extracting this into a helper method or using the same inline approach consistently.

[mfo]

je veux les commits propres.