feat(plugin-honcho): show what Honcho remembers about you

The opt-in page gains a debug panel, once the user's saved flag is on:
service status (reachability, latency, the caller's own processing
queue, with the specific Honcho error when something is wrong), a full
overview (peer card, derived facts with ids, summary) and one text
field with two actions — search (raw ranked facts) and ask (Honcho's
server-side LLM answers), plus an in-page mini-guide.

Every endpoint gates on the per-user opt-in server-side, fail closed,
and derives the peer from the authenticated Caller — never from the
request body — since the workspace is shared. Honcho 404s are
translated per-endpoint as 'no memory yet' rather than failures.

crates/plugin-honcho/i18n/fr.json

@@ -1,5 +1,10 @@
 {
   "plugin.honcho.err.admin_only": "Administrateur uniquement.",
   "plugin.honcho.err.base_url_empty": "Saisissez d'abord l'URL du serveur Honcho.",
-  "plugin.honcho.err.test_failed": "Impossible de joindre Honcho : {detail}"
+  "plugin.honcho.err.test_failed": "Impossible de joindre Honcho : {detail}",
+  "plugin.honcho.err.not_opted_in": "La mémoire à long terme est désactivée pour votre compte — activez-la ci-dessus avant de l'utiliser.",
+  "plugin.honcho.err.query_required": "Saisissez d'abord un texte.",
+  "plugin.honcho.err.honcho_unreachable": "Impossible de contacter le serveur Honcho : {detail}",
+  "plugin.honcho.err.honcho_error": "Honcho a renvoyé une erreur (HTTP {status}) : {detail}",
+  "plugin.honcho.err.no_data": "Honcho n'a pas encore de mémoire vous concernant — elle se construit au fil des conversations."
 }