P1 — Shorten SMART TROC WhatsApp acquisition message

[EagleFox31]

Parent: #3

Problem

The current WhatsApp acquisition message is long enough to trigger “Voir plus” and creates friction before the user even starts SMART TROC.

Goal

Replace the long message with a compact acquisition copy that explains the value, asks for only the essential information and points to SMART TROC.

Proposed content structure

1. One-line value proposition.
2. Essential inputs only: model, storage, condition, photos.
3. One CTA to SMART TROC.
4. Optional fallback: reply directly in WhatsApp.

Copy constraints

• no long explanation of cash / exchange / store credit in the opening message;
• no repeated explanation already available on the site;
• no dense emoji-heavy paragraph;
• keep the CTA link visually isolated;
• use language understandable without product jargon.

Acceptance criteria

• The default message fits on a normal mobile WhatsApp screen without a large collapsed “Voir plus” block where practical.
• The customer can understand what SMART TROC does in a few seconds.
• The four required inputs are explicit.
• The CTA to the site is obvious.
• A direct-WhatsApp fallback remains possible.
• Final copy is stored/documented in-repo or in the operational playbook so it does not drift across agents.

[EagleFox31]

Resolved by 1c20eb3 (feat(troc): autosave brouillon + robustesse photos + WhatsApp raccourci).