Add My Docs picker to deep-research, advocate, barnevernet, korrespond, citations

- PHP: Add docPickerSection (button + chips + hidden input) to all 5 tool pages
- JS: Send doc_ids in payload for deep-research, advocate, barnevernet, korrespond
- Backend: Inject selected corpus doc content into paste_text/narrative/notes via dbnToolsInjectDocContent
- Citations: Add upload zone (file → api/extract.php → textarea) + paste textarea with live Norwegian legal reference extraction (regex) + ref chips → title search; doc picker populates titleInput via MutationObserver

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/barnevernet.php

@@ -8,7 +8,6 @@ require_once __DIR__ . '/../includes/ToolModels.php';
 dbnToolsRequireMethod('POST');
 dbnToolsRequireAuth();
 $ftUid = dbnToolsFreeTierCheck('barnevernet');
-$ftRemaining = dbnToolsFreeTierDeduct($ftUid, 'barnevernet');
 
 @ini_set('output_buffering', '0');
 @ini_set('zlib.output_compression', '0');
@@ -19,7 +18,6 @@ ob_implicit_flush(true);
 header('Content-Type: application/x-ndjson; charset=utf-8');
 header('Cache-Control: no-store');
 header('X-Accel-Buffering: no');
-if ($ftRemaining >= 0) { header('X-Credits-Remaining: ' . $ftRemaining); }
 
 $language  = 'en';
 $startTime = microtime(true);
@@ -58,12 +56,12 @@ try {
     $engine         = ToolModels::engineForUser($ftUid, (string)($input['engine'] ?? 'azure_mini'));
     $sliceInput     = $input['slices'] ?? [];
     $controls       = is_array($input['controls'] ?? null) ? $input['controls'] : [];
-    $additionalNotes = mb_substr(trim((string)($input['additional_notes'] ?? '')), 0, 2000, 'UTF-8');
+    $additionalNotes = mb_substr(dbnToolsInjectDocContent($input, trim((string)($input['additional_notes'] ?? ''))), 0, 8000, 'UTF-8');
 
     if (mb_strlen($advocateRole, 'UTF-8') > 200) {
         throw new DbnToolsHttpException('advocate_role is too long.', 422, 'advocate_role_too_long');
     }
-    if (mb_strlen($additionalNotes, 'UTF-8') > 2000) {
+    if (mb_strlen($additionalNotes, 'UTF-8') > 8000) {
         throw new DbnToolsHttpException('additional_notes is too long.', 422, 'notes_too_long');
     }
 
@@ -150,6 +148,10 @@ try {
         'bvj_doc_type'  => $result['doc_meta']['doc_type'] ?? null,
     ]);
 
+    $ftRemaining = dbnToolsFreeTierDeduct($ftUid, 'barnevernet');
+    if ($ftRemaining >= 0) {
+        $result['balance'] = $ftRemaining;
+    }
 
     $emit('final', ['result' => $result]);