✨ Add LoginCard layout component

[damienlagae]

Summary

• Adds a LoginCard component to mutualise the centered-card-on-coloured-background markup recurring across Enabel apps (login, forgot password, reset password, external-login confirmation, etc.)
• Fullscreen wrapper with either a Bootstrap theme colour (background) or a cover image (backgroundImage)
• Bootstrap card with shadow-lg and border-radius: 1rem, optional centered logo (max-height 80 px) and h1.h3 title
• Card width via a size preset: sm (360 px) / md (480 px, default) / lg (640 px) / xl (800 px)
• Form goes inside {% block content %}

API

All parameters optional with sensible defaults:

Param	Type	Default
logo	?string	null
title	?string	null
background	string	'primary'
backgroundImage	?string	null
size	string	'md'

Strict validation: background restricted to the 8 Bootstrap theme colours, size to the 4 presets.

Modal variant

The issue mentioned this should also be usable inside a Bootstrap modal. Rather than complicating the API with a fullscreen flag, the doc explains the template-override path — copy templates/layout/login_card.html.twig into the project's templates/bundles/EnabelUx/, drop the outer min-vh-100 wrapper, done. Easy to revisit if a consumer pushes back.

Test plan

• PHPUnit: 227/227 (10 new tests: defaults, all valid backgrounds, all valid sizes, invalid value/type cases)
• php-cs-fixer: clean
• phpstan: no errors
• Manual smoke test in a consumer app (Impala) — render at least the login + password reset variants and a backgroundImage variant

Closes #19.

[damienlagae]

Smoke-tested in Impala — rendered four variants + invalid-size sanity check.

What I verified

Variant	Setup	Result
login	md, primary, logo + title, full form (username/password + Azure SSO button)	Card 480 px, Enabel teal background, logo + h3 title centred, form pristine
password reset	sm, secondary, no logo, email + button	Narrower 360 px card on orange secondary, no header, single-field form
signup	lg, success, logo + 6-field row layout	Card 640 px on green success, Bootstrap grid (row g-3 / col-md-6) inside {% block content %} works fine
bg-image	backgroundImage: 'images/enabel-symbol.png', md	asset()-resolved url, cover + center, card sits crisply over the image with its shadow-lg
size: 'xxl'	invalid preset	InvalidOptionsException raised by OptionsResolver — strict validation works

• card shadow-lg border-radius:1rem, centered logo (max-height 80 px) and h1.h3 all render as advertised
• Component plays nicely inside {% extends 'base.html.twig' %} with {% block header %}{% endblock %} (no double-wrapping issues)
• Bootstrap bg-{theme} classes pick up the Enabel theme colours from @enabel/enabel-bootstrap-theme automatically — no extra import needed in the consumer

Two small docs nudges (optional)

• The doc's basic example uses logo: asset('images/enabel-logo.png'), but the component already wraps the value in asset() inside the template. Passing the result of asset() again technically works (Symfony's asset helper is idempotent for absolute-looking paths in most cases), but the simpler form logo: 'images/enabel-logo.png' is what actually matches the template's contract. Might be worth fixing in the example to avoid copy-paste cargo-culting.
• For the modal variant, the doc mentions the override path. A one-liner snippet showing what to drop (d-flex align-items-center justify-content-center min-vh-100 p-3 bg-{background} → keep only the card) would save a future consumer 2 minutes.

LGTM, ready to tag.

[damienlagae]

Both nudges addressed in 753d513:

1. asset() redundancy — the basic-page example now uses logo: 'images/enabel-logo.png' directly, matching the template's contract (the template calls asset() internally).
2. Modal variant snippet — the override section now shows the exact before/after diff (drop the outer d-flex … min-vh-100 … wrapper, keep the inner card), plus a call-site snippet wrapping in modal-dialog modal-lg modal-dialog-centered.

Ready for re-check / merge.

[damienlagae]

Re-checked after 753d513. Both doc nudges addressed cleanly:

• asset() dropped from the basic example — matches the template's contract
• Modal-override section now shows the concrete before/after snippet, much more actionable

Component code unchanged since the previous smoke, so no need to re-run. Ready to merge.