feat(tools): persona selector across standalone tools + dashboard chat

Wire the legal-domain persona picker into corpus, deep-research, korrespond and
the dashboard chat. Each endpoint reads the chosen profile, resolves its packages
against client 57, and scopes retrieval via package_ids (falling back to family
when omitted). New dashboard tenants now subscribe to all DBN domain packages so
persona switching survives the subscription intersection.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

assets/js/deep-research.js

@@ -7,6 +7,7 @@
   let uploadFiles = [];
   let lastResult = null;
   let branchContext = null;
+  let persona = '';
 
   const SLICE_DEFS = [
     { id: 'family_core',      label: 'Family Law Core' },
@@ -42,6 +43,8 @@
       slices: Array.from(document.querySelectorAll('.dr-slice')),
       langButtons: Array.from(document.querySelectorAll('#drLangSwitcher .lang-btn')),
       engineRadios: Array.from(document.querySelectorAll('input[name="drEngine"]')),
+      personaControl: document.getElementById('drPersonaControl'),
+      personaSelect: document.getElementById('drPersonaSelect'),
       subQ: document.getElementById('drSubQ'),
       subQVal: document.getElementById('drSubQValue'),
       chunkLimit: document.getElementById('drChunkLimit'),
@@ -79,6 +82,7 @@
     bindUpload();
     bindModal();
     bindBranch();
+    loadPersonas();
     els.form.addEventListener('submit', onSubmit);
     els.results.addEventListener('click', (e) => {
       const btn = e.target.closest('.dr-branch-btn');
@@ -325,6 +329,7 @@
       language: lang,
       controls: getControls(),
     };
+    if (persona) payload.profile = persona;
     const _drDocIds = (document.getElementById('docPickerIds')?.value || '').split(',').map(Number).filter(Boolean);
     if (_drDocIds.length) payload.doc_ids = _drDocIds;
     if (branchContext) {
@@ -644,6 +649,33 @@
     </div>`;
   }
 
+  async function loadPersonas() {
+    if (!els.personaSelect) return;
+    try {
+      const r = await fetch('api/personas.php', { credentials: 'same-origin', headers: { Accept: 'application/json' } });
+      const data = await r.json().catch(() => ({}));
+      if (!r.ok || data.ok !== true || !Array.isArray(data.personas) || !data.personas.length) return;
+      const fallback = data.default_persona || 'family';
+      els.personaSelect.innerHTML = '';
+      data.personas.forEach((p) => {
+        const opt = document.createElement('option');
+        opt.value = p.slug;
+        opt.textContent = p.name || p.slug;
+        els.personaSelect.appendChild(opt);
+      });
+      const saved = sessionStorage.getItem('dbnPersona');
+      const initial = (saved && data.personas.some((p) => p.slug === saved)) ? saved
+        : (data.personas.some((p) => p.slug === fallback) ? fallback : data.personas[0].slug);
+      persona = initial;
+      els.personaSelect.value = initial;
+      els.personaSelect.addEventListener('change', () => {
+        persona = els.personaSelect.value;
+        sessionStorage.setItem('dbnPersona', persona);
+      });
+      els.personaControl?.classList.remove('is-hidden');
+    } catch (_) { /* personas are optional UI sugar; ignore failures */ }
+  }
+
   function bindBranch() {
     if (!els.branchClear) return;
     els.branchClear.addEventListener('click', clearBranch);