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/login.html

@@ -5,7 +5,7 @@
 
 {% block content %}
 <section class="min-h-[calc(100vh-62px)] bg-brand-bg py-16 px-4" aria-labelledby="login-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="login-title" class="text-3xl font-black text-brand-navy mb-2">Connexion</h1>
     <p class="text-sm text-brand-navy/70 mb-6">{{ "Bienvenue sur DictIA — la transcription IA conforme à la Loi&nbsp;25." | safe }}</p>
 
@@ -28,7 +28,7 @@
       <div class="space-y-3 mb-6" aria-label="Connexion fédérée">
         {% if oauth_microsoft_enabled %}
           <a href="{{ url_for('auth.oauth_provider_login', provider='microsoft') }}"
-             class="w-full inline-flex items-center justify-center gap-3 px-4 py-3 bg-white border border-brand-border rounded-[0.75rem] text-brand-navy font-semibold hover:bg-brand-bg transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+             class="w-full inline-flex items-center justify-center gap-3 px-4 py-3 bg-white border border-brand-border rounded-lg text-brand-navy font-semibold hover:bg-brand-bg transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
             {# Official Microsoft 4-square logo #}
             <svg width="20" height="20" viewBox="0 0 21 21" aria-hidden="true" focusable="false">
               <rect x="1"  y="1"  width="9" height="9" fill="#F25022"/>
@@ -42,7 +42,7 @@
 
         {% if oauth_google_enabled %}
           <a href="{{ url_for('auth.oauth_provider_login', provider='google') }}"
-             class="w-full inline-flex items-center justify-center gap-3 px-4 py-3 bg-white border border-brand-border rounded-[0.75rem] text-brand-navy font-semibold hover:bg-brand-bg transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+             class="w-full inline-flex items-center justify-center gap-3 px-4 py-3 bg-white border border-brand-border rounded-lg text-brand-navy font-semibold hover:bg-brand-bg transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
             {# Official Google "G" logo #}
             <svg width="20" height="20" viewBox="0 0 24 24" aria-hidden="true" focusable="false">
               <path fill="#4285F4" d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92a5.06 5.06 0 0 1-2.2 3.32v2.76h3.56c2.08-1.92 3.28-4.74 3.28-8.09Z"/>
@@ -56,7 +56,7 @@
 
         {% if sso_enabled %}
           <a href="{{ url_for('auth.sso_login') }}"
-             class="w-full inline-flex items-center justify-center gap-3 px-4 py-3 bg-white border border-brand-border rounded-[0.75rem] text-brand-navy font-semibold hover:bg-brand-bg transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
+             class="w-full inline-flex items-center justify-center gap-3 px-4 py-3 bg-white border border-brand-border rounded-lg text-brand-navy font-semibold hover:bg-brand-bg transition focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2">
             <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" focusable="false">
               <rect x="3" y="11" width="18" height="11" rx="2"/>
               <path d="M7 11V7a5 5 0 0 1 10 0v4"/>
@@ -81,13 +81,13 @@
 
         <div>
           <label for="email" class="block text-sm font-medium text-brand-navy mb-1">Courriel <span class="text-red-600" aria-hidden="true">*</span></label>
-          {{ form.email(id='email', type='email', autocomplete='email', required=true, **{'aria-required':'true', 'class':'w-full px-3 py-2 border border-brand-border rounded-[0.5rem] text-brand-navy focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2'}) }}
+          {{ form.email(id='email', type='email', autocomplete='email', required=true, **{'aria-required':'true', 'class':'w-full px-3 py-2 border border-brand-border rounded-md text-brand-navy focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2'}) }}
           {% if form.email.errors %}<p class="text-xs text-red-700 mt-1" role="alert">{{ form.email.errors[0] }}</p>{% endif %}
         </div>
 
         <div>
           <label for="password" class="block text-sm font-medium text-brand-navy mb-1">Mot de passe <span class="text-red-600" aria-hidden="true">*</span></label>
-          {{ form.password(id='password', autocomplete='current-password', required=true, **{'aria-required':'true', 'class':'w-full px-3 py-2 border border-brand-border rounded-[0.5rem] text-brand-navy focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2'}) }}
+          {{ form.password(id='password', autocomplete='current-password', required=true, **{'aria-required':'true', 'class':'w-full px-3 py-2 border border-brand-border rounded-md text-brand-navy focus-visible:outline-2 focus-visible:outline-brand-b1 focus-visible:outline-offset-2'}) }}
           {% if form.password.errors %}<p class="text-xs text-red-700 mt-1" role="alert">{{ form.password.errors[0] }}</p>{% endif %}
         </div>
 
@@ -99,7 +99,7 @@
           <a href="{{ url_for('auth.forgot_password') }}" class="grad-text font-semibold hover:underline">Mot de passe oublié&nbsp;?</a>
         </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">
           Se connecter
         </button>
       </form>