Add manual 'Save result' to all tools — replaces auto-save

All tool results can now be saved to My Case manually. Users click
'Save result', type a description, and confirm. This replaces the
previous silent auto-save on barnevernet/timeline/etc., giving users
control over what stays and what it's called (supports multiple runs
of the same tool with different titles).

- CaseResults: extend ELIGIBLE_TOOLS to include summarize, ask, redact,
  transcribe; add toolLabel/toolIcon entries; support explicit title
  via meta['title'] in save()
- api/case/save-result.php: new client-initiated save endpoint;
  accepts tool + title + input_payload + output_payload + meta
- Remove CaseResults::save() auto-save from barnevernet, deep-research,
  discrepancy, korrespond, timeline API endpoints
- tools.js: add showSaveResultButton() (exposed as window.dbnShowSaveResultButton);
  wire for ask, redact, timeline, transcribe (both file-upload and
  stored-audio paths)
- barnevernet.js: wire save button after final result render
- summarize.js: wire save button after renderFinal(); passes sumResults
  container so widget appears in the correct #sumResults div
- case-result.php: rich tool-specific rendering for summarize, ask,
  redact, transcribe, timeline; update re-run link map to include all
  new tools
- tools.css: styles for .save-result-widget and its states (idle,
  prompt, done, error)

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

api/barnevernet.php

@@ -3,7 +3,6 @@ declare(strict_types=1);
 
 require_once __DIR__ . '/../includes/bootstrap.php';
 require_once __DIR__ . '/../includes/BvjAnalyzerAgent.php';
-require_once __DIR__ . '/../includes/CaseResults.php';
 require_once __DIR__ . '/../includes/ToolModels.php';
 
 dbnToolsRequireMethod('POST');
@@ -151,19 +150,6 @@ try {
         'bvj_doc_type'  => $result['doc_meta']['doc_type'] ?? null,
     ]);
 
-    if ($ftUid > 0) {
-        $ownerId = CaseStore::caseResolveClientId($ftUid);
-        $resultId = CaseResults::save($ftUid, $ownerId, 'barnevernet', $input, $result, [
-            'used_case_context' => $useMyCase ? 1 : 0,
-            'case_doc_ids'      => dbnToolsLastCaseDocIds(),
-            'model'             => $result['trace_metadata']['deployment'] ?? $engine,
-            'latency_ms'        => $result['latency_ms'],
-            'credits_charged'   => FreeTier::cost('barnevernet'),
-        ]);
-        if ($resultId > 0) {
-            $result['result_id'] = $resultId;
-        }
-    }
 
     $emit('final', ['result' => $result]);