fix(marketing): A-2.8a — extract pricing partial + sync bento + OQLF + test calibration

- Extract 3 pricing tiers to templates/marketing/_partials/_pricing_tiers.html
  Single source of truth — landing.html and tarifs.html now {% include %} it.
  Prevents price drift (LPC art. 219 risk).
- Sync bento card #2 description across landing + fonctionnalites
  (was diverged: 'embeddings' vs 'embeddings vocaux'). Add maintenance
  reminder comments in both files.
- Fix OQLF NBSP on '~2 semaines' matrix cells in /tarifs deep-dive table.
- Fix mixed UTF-8/entity 'québécois' -> 'québécois' in tech
  specs (consistent with rest of file).
- Calibrate H2 size on /tarifs FAQ to match landing (clamp 2.75rem cap).
- Repair 2 pre-existing test bugs from earlier A-2.x commits:
  * 'violent la Loi 25' -> accept both NBSP and plain forms (commit 7c6c6fd
    added the NBSP after the test was written)
  * 'résilie' -> 'résilie' (Jinja outputs raw UTF-8, not entities)
- Update src/marketing/routes.py module docstring to reflect 2/4 done.

templates/marketing/landing.html

@@ -195,10 +195,12 @@
       </h2>
     </div>
 
+    {# NOTE: bento card content is duplicated between landing.html and fonctionnalites.html.
+       When editing, sync both files. Future refactor: extract to _partials/_bento_features.html. #}
     {% from 'macros/bento.html' import bento_card %}
     <div class="grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 gap-[1.5px] bg-brand-border rounded-[18px] overflow-hidden">
       {{ bento_card('01', 'Transcription WhisperX', 'Large-v3 fine-tuné FR-CA. Précision 95&nbsp;%+ sur réunions, dictées, audiences (méthodologie disponible sur demande).', '🎙️') }}
-      {{ bento_card('02', 'Diarisation 8 locuteurs', 'pyannote sépare automatiquement les intervenants. Identification par embeddings.', '👥') }}
+      {{ bento_card('02', 'Diarisation 8 locuteurs', 'pyannote sépare automatiquement les intervenants. Identification par embeddings vocaux.', '👥') }}
       {{ bento_card('03', 'Résumés Mistral 7B', 'IA locale génère résumés, points d\'action et procès-verbaux. Aucune connexion cloud.', '📝') }}
       {{ bento_card('04', 'Q&amp;R sur enregistrement', 'Posez des questions à vos réunions. RAG local sur embeddings sentence-transformers.', '💬') }}
       {{ bento_card('05', 'Exports multiples', 'DOCX, PDF, SRT, VTT, TXT, JSON, MD. Formats avocat, notaire, CPA.', '📄') }}
@@ -220,34 +222,7 @@
       </p>
     </div>
 
-    {% from 'macros/pricing_card.html' import pricing_card %}
-    <div class="grid md:grid-cols-3 gap-6 max-w-5xl mx-auto items-stretch">
-      {{ pricing_card(
-        'dictia-8',
-        'DictIA 8',
-        '3&nbsp;450&nbsp;$',
-        '173&nbsp;$',
-        'PME · RH · Manufacturiers',
-        ['GPU 8&nbsp;Go RTX', 'Volume illimité', 'WhisperX FR-CA', 'Diarisation 8 locuteurs', 'Support inclus']
-      ) }}
-      {{ pricing_card(
-        'dictia-16',
-        'DictIA 16',
-        '5&nbsp;750&nbsp;$',
-        '201&nbsp;$',
-        'Cabinets juridiques · CPA · Finance',
-        ['GPU 16&nbsp;Go RTX', 'Mistral 7B local', 'Q&amp;R sur enregistrement', 'Tout DictIA 8', 'Support prioritaire'],
-        recommended=True
-      ) }}
-      {{ pricing_card(
-        'dictia-cloud',
-        'DictIA Cloud',
-        '0&nbsp;$',
-        '369&nbsp;$',
-        'Organismes · Municipalités · Multi-sites',
-        ['Hébergé OVH Beauharnois (Québec)', 'Opérationnel sous 48&nbsp;h', 'Aucun matériel à gérer', 'SLA visé 99,9&nbsp;%', 'Conforme Loi&nbsp;25']
-      ) }}
-    </div>
+    {% include 'marketing/_partials/_pricing_tiers.html' %}
 
     {# ROI CALCULATOR — Alpine.js, hypotheses transparentes pour LPC art. 219 hygiene #}
     <div x-data="roiCalculator()" class="mt-16 max-w-3xl mx-auto bg-white p-8 rounded-[18px] border border-brand-border" aria-labelledby="roi-title">