fix(ai): liste de modeles corrompue et cles i18n brutes (BUG-009)

Locales chargees en cache no-store + SW_VERSION v4 pour eviter les cles brutes (fr.json obsolete). Picker : styles critiques en ligne (popover/liste/options), plafond de 200 modeles avec indicateur, et non-chevauchement entre la liste de modeles et la bulle de capacites.

tests/frontend/ai.test.mjs

@@ -959,6 +959,36 @@ async function main() {
     localStorage.clear();
   });
 
+  // ── 42. Picker handles very long model lists (OpenRouter) ──
+  await test("picker caps long model lists and keeps options block-laid-out", async () => {
+    localStorage.clear();
+    const models = Array.from({ length: 250 }, (_, i) => `vendor-${i}/model-${i}:free`);
+    globalThis.fetch = async (url) => {
+      const u = String(url);
+      if (u.includes("/api/ai/status")) {
+        return { ok: true, status: 200, json: async () => ({ configured: true, providers: { openrouter: { available: true } } }) };
+      }
+      if (u.includes("/api/config/ai-models")) {
+        return { ok: true, status: 200, json: async () => ({ models, source: "live" }) };
+      }
+      if (u.includes("/api/ai/model-capabilities")) {
+        return { ok: true, status: 200, json: async () => ({ capabilities: { chat: true, vision: true } }) };
+      }
+      return { ok: true, status: 200, json: async () => ({}) };
+    };
+    localStorage.setItem("obsigate_ai_picker", JSON.stringify({ provider: "openrouter" }));
+    const picker = await ai.buildAIPickerUI();
+    document.body.appendChild(picker);
+    await sleep(30);
+    picker.querySelector(".ai-picker-model-trigger").click();
+    const options = picker.querySelectorAll(".ai-picker-model-option");
+    assert.equal(options.length, 200, "rendered options are capped");
+    assert.ok(picker.querySelector(".ai-picker-model-more"), "a 'more results' hint is shown");
+    assert.ok(options[0].style.display === "block", "options are block-laid-out even without CSS");
+    picker.remove();
+    localStorage.clear();
+  });
+
   // ── Summary ──
   console.log(`\n${passCount}/${testCount} tests passed`);
   if (passCount !== testCount) {