refactor(ui): modernize button + input border radii (rounded-lg/md/xl, sharper SaaS aesthetic)

Aligns DictIA marketing/auth/legal/billing templates with modern SaaS visual
conventions (Linear, Vercel, Stripe Dashboard, Notion). Old radii (12-18px)
felt dated; new system uses 6-12px for tighter, more contemporary corners.

Border radius system:
- Buttons (CTA, submit, secondary): rounded-[0.75rem] (12px) -> rounded-lg (8px)
- Form inputs (text/email/password/select/textarea/checkbox): rounded-[0.5rem] -> rounded-md (6px)
- Cards (pricing, bento, modals, content panels): rounded-[18px]/[14px]/[12px] -> rounded-xl (12px)
- Pricing card outer gradient frame: rounded-[20px] -> rounded-xl (matches inner)
- Pills / badges / status chips: KEEP rounded-full
- Avatars / circular icon containers: KEEP rounded-full
- Code blocks: KEEP rounded (4px)

Decision tree applied for ambiguous cases:
- Button-like clickable CTA -> rounded-lg
- Form input -> rounded-md
- Card / panel / modal -> rounded-xl
- Badge / pill / chip / avatar -> rounded-full (preserved)

In-scope templates modified (23):
- macros/button.html (central macro, cascades to all callers)
- macros/pricing_card.html, macros/bento.html
- marketing/landing.html, tarifs.html, fonctionnalites.html, conformite.html, contact.html
- auth/check_email.html, forgot_password.html, magic_link_request.html, oauth_finish_signup.html,
  passkey_setup.html, reset_password.html, totp_setup.html, totp_verify.html, verify_success.html
- billing/cancel.html, billing/success.html
- legal/_layout.html, legal/index.html
- register.html, login.html

Out of scope (untouched): index.html, account.html, admin.html, share.html, inquire.html,
group-admin.html, components/**, includes/**, modals/** (all legacy Speakr Vue surfaces).

Tests: test_marketing_landing_template.py — 2 assertions updated to match new bento icon
(rounded-md) and pricing card frame (rounded-xl). All 18 legal tests + 58 marketing landing
tests + 9 signup_loi25 tests still pass. Decorative rounded-full preserved on hero cosmic
orbs and ordres-pros avatar circles.

Diff: 94 insertions / 94 deletions (1:1 mechanical replacement, no class drift).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

templates/auth/totp_setup.html

@@ -5,7 +5,7 @@
 
 {% block content %}
 <section class="min-h-[calc(100vh-62px)] bg-brand-bg py-16 px-4" aria-labelledby="totp-setup-title">
-  <div class="max-w-2xl mx-auto bg-white p-8 rounded-[18px] border border-brand-border shadow-cta">
+  <div class="max-w-2xl mx-auto bg-white p-8 rounded-xl border border-brand-border shadow-cta">
     <h1 id="totp-setup-title" class="text-3xl font-black text-brand-navy mb-2">Configurer la double authentification</h1>
     <p class="text-sm text-brand-navy/70 mb-6">{{ "La double authentification (2FA) ajoute une seconde étape lors de la connexion, en plus de votre mot de passe. Une exigence forte recommandée pour les comptes traitant des données confidentielles (Loi&nbsp;25)." | safe }}</p>
 
@@ -36,7 +36,7 @@
       <li>
         <h2 class="text-lg font-bold text-brand-navy mb-2"><span class="grad-text">2.</span> Scannez le code QR</h2>
         <div class="flex flex-col md:flex-row gap-6 items-start">
-          <div class="bg-brand-bg border border-brand-border rounded-[0.75rem] p-4 flex-shrink-0">
+          <div class="bg-brand-bg border border-brand-border rounded-lg p-4 flex-shrink-0">
             <img src="{{ qr_data_url }}" alt="Code QR pour configurer DictIA dans votre application authenticator" class="w-48 h-48 mx-auto block">
           </div>
           <div class="text-sm text-brand-navy/80 space-y-2">
@@ -49,11 +49,11 @@
 
       <li>
         <h2 class="text-lg font-bold text-brand-navy mb-2"><span class="grad-text">3.</span> Conservez vos codes de récupération</h2>
-        <div role="alert" class="bg-amber-50 border border-amber-200 rounded-[0.75rem] p-4 mb-3">
+        <div role="alert" class="bg-amber-50 border border-amber-200 rounded-lg p-4 mb-3">
           <p class="text-sm font-semibold text-amber-900 mb-2">Important — ces codes ne seront affichés qu'une seule fois.</p>
           <p class="text-xs text-amber-900/90">Imprimez-les ou enregistrez-les dans votre gestionnaire de mots de passe. Chaque code est à usage unique et permettra de vous reconnecter si vous perdez l'accès à votre application authenticator.</p>
         </div>
-        <pre id="recovery-codes" class="bg-brand-navy text-white text-sm font-mono p-4 rounded-[0.75rem] whitespace-pre-wrap select-all">{% for c in recovery_codes %}{{ c }}
+        <pre id="recovery-codes" class="bg-brand-navy text-white text-sm font-mono p-4 rounded-lg whitespace-pre-wrap select-all">{% for c in recovery_codes %}{{ c }}
 {% endfor %}</pre>
         <button type="button" onclick="(function(){var t=document.getElementById('recovery-codes').innerText;if(navigator.clipboard){navigator.clipboard.writeText(t);}var b=document.getElementById('copy-btn');b.textContent='Copié dans le presse-papiers';setTimeout(function(){b.textContent='Copier les codes';},2000);})();"
                 id="copy-btn"
@@ -74,11 +74,11 @@
             <input type="text" id="code" name="code" required aria-required="true"
                    inputmode="numeric" autocomplete="one-time-code"
                    pattern="[0-9]{6}" maxlength="6"
-                   class="w-full md:w-48 px-3 py-2 border border-brand-border rounded-[0.5rem] text-brand-navy text-center text-xl font-mono tracking-widest focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2"
+                   class="w-full md:w-48 px-3 py-2 border border-brand-border rounded-md text-brand-navy text-center text-xl font-mono tracking-widest focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2"
                    placeholder="000000" autofocus>
           </div>
 
-          <button type="submit" class="grad-bg text-white font-semibold py-3 px-6 rounded-[0.75rem] 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="grad-bg text-white font-semibold py-3 px-6 rounded-lg shadow-cta hover:shadow-cta-hover transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
             Activer la double authentification
           </button>
         </form>