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_verify.html

@@ -5,7 +5,7 @@
 
 {% block content %}
 <section class="min-h-[calc(100vh-62px)] bg-brand-bg py-16 px-4" aria-labelledby="totp-verify-title">
-  <div class="max-w-md mx-auto bg-white p-8 rounded-[18px] border border-brand-border shadow-cta">
+  <div class="max-w-md mx-auto bg-white p-8 rounded-xl border border-brand-border shadow-cta">
     <h1 id="totp-verify-title" class="text-3xl font-black text-brand-navy mb-2">Vérification en deux étapes</h1>
     <p class="text-sm text-brand-navy/70 mb-6">Entrez le code à 6 chiffres affiché dans votre application authenticator pour terminer la connexion.</p>
 
@@ -31,7 +31,7 @@
     {% if has_passkeys %}
     <section class="mb-6" aria-labelledby="passkey-section-title">
       <h2 id="passkey-section-title" class="text-base font-semibold text-brand-navy mb-3">Connexion par Passkey</h2>
-      <button id="passkey-auth-btn" type="button" class="w-full grad-bg text-white font-semibold py-3 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 id="passkey-auth-btn" type="button" class="w-full grad-bg text-white font-semibold py-3 rounded-lg shadow-cta hover:shadow-cta-hover transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
         Utiliser ma Passkey
       </button>
       <p id="passkey-status" class="text-xs text-brand-navy/70 mt-2" role="status" aria-live="polite"></p>
@@ -54,11 +54,11 @@
         <input type="text" id="code" name="code"
                inputmode="numeric" autocomplete="one-time-code"
                pattern="[0-9]{6}" maxlength="6"
-               class="w-full px-3 py-3 border border-brand-border rounded-[0.5rem] text-brand-navy text-center text-2xl font-mono tracking-widest focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2"
+               class="w-full px-3 py-3 border border-brand-border rounded-md text-brand-navy text-center text-2xl 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="w-full grad-bg text-white font-semibold py-3 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="w-full grad-bg text-white font-semibold py-3 rounded-lg shadow-cta hover:shadow-cta-hover transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
         Vérifier et se connecter
       </button>
     </form>
@@ -74,11 +74,11 @@
           <label for="recovery_code" class="block text-sm font-medium text-brand-navy mb-1">Code de récupération <span class="text-red-600" aria-hidden="true">*</span></label>
           <input type="text" id="recovery_code" name="recovery_code"
                  autocomplete="off"
-                 class="w-full px-3 py-2 border border-brand-border rounded-[0.5rem] text-brand-navy font-mono uppercase focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2"
+                 class="w-full px-3 py-2 border border-brand-border rounded-md text-brand-navy font-mono uppercase focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2"
                  placeholder="XXXXX-XXXXX">
           <p class="text-xs text-brand-navy/60 mt-1">Format&nbsp;: 5 caractères + tiret + 5 caractères. Chaque code est à usage unique.</p>
         </div>
-        <button type="submit" class="w-full bg-brand-navy text-white font-semibold py-3 rounded-[0.75rem] hover:bg-brand-navy2 transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+        <button type="submit" class="w-full bg-brand-navy text-white font-semibold py-3 rounded-lg hover:bg-brand-navy2 transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
           Utiliser le code de récupération
         </button>
         <p class="text-xs text-brand-navy/60 text-center" aria-live="polite">{{ recovery_codes_remaining }} code{{ 's' if recovery_codes_remaining != 1 else '' }} de récupération restant{{ 's' if recovery_codes_remaining != 1 else '' }}.</p>