redact: UX overhaul — engine simplification, credits, spinner, save-to-docs, badges

- Remove GPU/regex engine options; keep only azure_mini (1 credit) and azure_full (2 credits)
- Variable credit cost: engine-aware pre-check and charge in api/redact.php; PricingCatalog base = 1
- Fix ATTORNEY not preserved when keepOfficials=true: add to LLM prompt, generic-tag, pseudonym regexes
- Replace Azure credits hint with per-engine credit cost text (all 4 languages)
- Single-file upload only (was: up to 5); simplify status messages
- Clear previous redaction output and show pulsing spinner when a new run starts
- Add "Save to My Docs" button in redact output panel (corpus-save.js path)
- corpus-save.js: capture source_doc_ids from button dataset, pass in POST payload
- api/save-to-corpus.php: accept source_doc_ids, store first as source_url=corpus-doc:{id}
- doc-picker.js: show "✂ Redacted" badge for documents saved from the redact tool
- CSS: .redact-working spinner, doc-item__badge--redact pill styles

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

assets/js/corpus-save.js

@@ -41,6 +41,7 @@
   }
 
   function bodyFor(kind, payload) {
+    const sourceDocIds = (payload.sourceDocIds || '').split(',').map(s => s.trim()).filter(Boolean);
     if (window.DBN_DASHBOARD) {
       return JSON.stringify({
         title: payload.title,
@@ -48,6 +49,7 @@
         source_tool: payload.tool || 'dashboard-save',
         tags: payload.tags,
         kind,
+        ...(sourceDocIds.length ? { source_doc_ids: sourceDocIds } : {}),
       });
     }
     return JSON.stringify({
@@ -55,6 +57,7 @@
       content: payload.content,
       source_tool: payload.tool || '',
       tags: payload.tags,
+      ...(sourceDocIds.length ? { source_doc_ids: sourceDocIds } : {}),
     });
   }
 
@@ -74,9 +77,10 @@
     }
 
     _pendingBtn = btn;
-    dlg.dataset.pendingContent = content;
-    dlg.dataset.pendingTool    = btn.dataset.tool || '';
-    dlg.dataset.pendingKind    = 'tool_output';
+    dlg.dataset.pendingContent       = content;
+    dlg.dataset.pendingTool          = btn.dataset.tool || '';
+    dlg.dataset.pendingKind          = 'tool_output';
+    dlg.dataset.pendingSourceDocIds  = btn.dataset.sourceDocIds || '';
 
     titleIn.value = btn.dataset.suggestedTitle || '';
     tagsIn.value  = '';
@@ -90,12 +94,13 @@
     e.preventDefault();
     dlg.close();
 
-    const btn     = _pendingBtn;
-    const content = dlg.dataset.pendingContent || '';
-    const tool    = dlg.dataset.pendingTool    || '';
-    const kind    = dlg.dataset.pendingKind    || 'tool_output';
-    const title   = titleIn.value.trim();
-    const tags    = tagsIn.value.trim();
+    const btn           = _pendingBtn;
+    const content       = dlg.dataset.pendingContent      || '';
+    const tool          = dlg.dataset.pendingTool         || '';
+    const kind          = dlg.dataset.pendingKind         || 'tool_output';
+    const sourceDocIds  = dlg.dataset.pendingSourceDocIds || '';
+    const title         = titleIn.value.trim();
+    const tags          = tagsIn.value.trim();
 
     if (!title || !content) return;
 
@@ -109,7 +114,7 @@
         method:  'POST',
         credentials: 'same-origin',
         headers: { 'Content-Type': 'application/json' },
-        body: bodyFor(kind, { title, content, tool, tags }),
+        body: bodyFor(kind, { title, content, tool, tags, sourceDocIds }),
       });
       const data = await resp.json().catch(() => ({}));
 
@@ -146,6 +151,7 @@
     delete dlg.dataset.pendingContent;
     delete dlg.dataset.pendingTool;
     delete dlg.dataset.pendingKind;
+    delete dlg.dataset.pendingSourceDocIds;
   });
 
   function showToast(msg, isError) {