refactor(ui): V3 fully square buttons + inputs (rounded-none, brutalist/Swiss aesthetic)

V3 finalizes the radii pass to a fully brutalist/Swiss visual language:

- Buttons (CTAs, submit, secondary, ghost, OAuth provider tiles): rounded-none (0px)
- Form inputs (text/email/password/select/textarea/code-entry): rounded-none (0px)
- Checkboxes: rounded-none (0px) — was rounded-sm
- Small icon tiles (w-10 h-10 / w-12 h-12 grad-bg squares): rounded-none (0px)
- Inline code blocks (totp recovery <pre>, secret <code>): rounded-none (0px)
- Cards (pricing, bento, content panels, modals, prev/next nav): rounded (4px) — was rounded-lg
- Alert / flash boxes: rounded (4px) — was rounded-lg
- Pills, badges, status chips, ordres pros avatars, decorative cosmic orbs: rounded-full preserved
- Legal _layout.html inline <style> blockquote/pre/code/draft-callout: border-radius 0 — was 4px

Updated tests/test_marketing_landing_template.py assertions:
- bento icon assertion: "grad-bg rounded " -> "grad-bg rounded-none "
- pricing recommended frame: "rounded-lg" -> "rounded" (with strict trailing-char match to avoid rounded-none false positive)

Verification: 18/18 legal tests pass, 58/58 marketing landing tests pass, 5/5 root redirect tests pass. Two pre-existing failures in test_marketing_secondary_pages (SOC 2 hedge text + gitea.innova-ai.ca URL) are unrelated to this radii pass.

templates/auth/oauth_finish_signup.html

@@ -5,7 +5,7 @@
 
 {% block content %}
 <section class="min-h-[calc(100vh-62px)] bg-brand-bg py-16 px-4" aria-labelledby="finish-title">
-  <div class="max-w-md mx-auto bg-white p-8 rounded-lg border border-brand-border shadow-cta">
+  <div class="max-w-md mx-auto bg-white p-8 rounded border border-brand-border shadow-cta">
     <h1 id="finish-title" class="text-3xl font-black text-brand-navy mb-2">Finaliser votre inscription</h1>
     <p class="text-sm text-brand-navy/70 mb-6">
       Vous vous inscrivez via <strong>{{ provider_display or provider | capitalize }}</strong>. Avant de créer votre compte DictIA, nous devons obtenir vos consentements conformément à la {{ "Loi&nbsp;25" | safe }} du Québec.
@@ -14,7 +14,7 @@
     {% with messages = get_flashed_messages(with_categories=true) %}
       {% if messages %}
         {% for category, message in messages %}
-          <div role="alert" class="mb-3 p-3 rounded-lg text-sm
+          <div role="alert" class="mb-3 p-3 rounded text-sm
             {% if category == 'danger' %}bg-red-50 text-red-900 border border-red-200
             {% elif category == 'warning' %}bg-amber-50 text-amber-900 border border-amber-200
             {% elif category == 'success' %}bg-green-50 text-green-900 border border-green-200
@@ -26,7 +26,7 @@
     {% endwith %}
 
     {# Pre-filled email from OAuth provider — display only, not editable #}
-    <div class="bg-brand-bg border border-brand-border rounded p-3 mb-6 text-sm">
+    <div class="bg-brand-bg border border-brand-border rounded-none p-3 mb-6 text-sm">
       <p class="text-brand-navy/70 mb-1">Compte fédéré :</p>
       <p class="text-brand-navy font-semibold break-all">{{ userinfo.email }}</p>
       {% if userinfo.name %}<p class="text-brand-navy/80 text-xs mt-1">{{ userinfo.name }}</p>{% endif %}
@@ -41,32 +41,32 @@
 
         <label for="consent_cgu" class="flex items-start gap-2 text-sm text-brand-navy/90">
           <input type="checkbox" id="consent_cgu" name="consent_cgu" value="y" required aria-required="true"
-                 class="mt-1 rounded-sm focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+                 class="mt-1 rounded-none focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
           <span>J'accepte les <a href="/legal/conditions" target="_blank" rel="noopener" class="grad-text underline">conditions d'utilisation</a>. <span class="text-red-600" aria-hidden="true">*</span></span>
         </label>
         {% if errors.consent_cgu %}<p class="text-xs text-red-900 mt-1" role="alert">{{ errors.consent_cgu }}</p>{% endif %}
 
         <label for="consent_confidentialite" class="flex items-start gap-2 text-sm text-brand-navy/90">
           <input type="checkbox" id="consent_confidentialite" name="consent_confidentialite" value="y" required aria-required="true"
-                 class="mt-1 rounded-sm focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+                 class="mt-1 rounded-none focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
           <span>J'accepte la <a href="/legal/confidentialite" target="_blank" rel="noopener" class="grad-text underline">politique de confidentialité</a>. <span class="text-red-600" aria-hidden="true">*</span></span>
         </label>
         {% if errors.consent_confidentialite %}<p class="text-xs text-red-900 mt-1" role="alert">{{ errors.consent_confidentialite }}</p>{% endif %}
 
         <label for="consent_marketing" class="flex items-start gap-2 text-sm text-brand-navy/90">
           <input type="checkbox" id="consent_marketing" name="consent_marketing" value="y"
-                 class="mt-1 rounded-sm focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+                 class="mt-1 rounded-none focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
           <span>J'accepte de recevoir des communications marketing (optionnel, désactivable à tout moment).</span>
         </label>
 
         <label for="consent_analytics" class="flex items-start gap-2 text-sm text-brand-navy/90">
           <input type="checkbox" id="consent_analytics" name="consent_analytics" value="y"
-                 class="mt-1 rounded-sm focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+                 class="mt-1 rounded-none focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
           <span>J'accepte les statistiques d'usage anonymisées (optionnel, désactivable à tout moment).</span>
         </label>
       </fieldset>
 
-      <button type="submit" class="w-full grad-bg text-white font-semibold py-3 rounded shadow-cta hover:shadow-cta-hover transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+      <button type="submit" class="w-full grad-bg text-white font-semibold py-3 rounded-none shadow-cta hover:shadow-cta-hover transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
         Créer mon compte DictIA
       </button>
     </form>