ai smart auto-documentation and text rewrite

- Store captureMetadata (OCR text, window/app/element info) with each
  step at capture time so AI always has the original rich context.
- Add buildCaptureContext() to TextIntelService; capture.js uses it
  instead of buildCaptureTitle() so both title and metadata come from
  one pass.
- generateStepPatch() prefers stored captureMetadata over re-running
  OCR, giving the AI the best possible context when the user clicks
  an AI button later.
- Add autoDoc setting: when enabled every capture (shoot, region, and
  session hotkey/click) is automatically documented by AI. Manual
  captures await AI before returning; session captures fire-and-forget
  and push a step:updated event so the renderer reloads seamlessly.
- Add ai:rewriteText IPC and rewriteText() method for plain-text
  polishing via a separate callOllamaText() that skips JSON mode.
- Add "AI Rewrite" section in the editor right panel: textarea + AI
  button that rewrites whatever the user types in place.
- Improve buildAiPrompt() rules: action-focused title instructions,
  explicit anti-junk rules (no "Capture the screen / OCR" blocks),
  and a context-quality gate that suppresses blocks when context is
  thin.
- Add autoDoc checkbox to AI settings dialog.
- Renderer handles step:updated to reload the selected step after
  background auto-doc finishes.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

app/renderer/dialogs.js

@@ -315,6 +315,7 @@ function showSettingsDialog({
     const confirmSimple = el('input', { type: 'checkbox', checked: Boolean(settings.capture?.confirmSimpleCapture) });
     const keepLast = makeInput(settings.backups?.keepLast ?? 10, 'number', { min: 0, step: 1 });
     const aiEnabled = el('input', { type: 'checkbox', checked: Boolean(settings.ai?.enabled) });
+    const aiAutoDoc = el('input', { type: 'checkbox', checked: Boolean(settings.ai?.autoDoc) });
     const ollamaHost = makeInput(settings.ai?.ollama?.host || 'http://127.0.0.1:11434');
     const ollamaModel = makeInput(settings.ai?.ollama?.model || 'llama3.2:1b');
     const aiStatus = el('div', { className: 'muted ai-status' }, 'AI stays local through Ollama. Nothing is sent to the cloud.');
@@ -408,7 +409,8 @@ function showSettingsDialog({
       ),
       el('fieldset', {},
         el('legend', {}, 'AI'),
-        labeledRow('Enable AI text filling', aiEnabled),
+        labeledRow('Enable AI', aiEnabled),
+        labeledRow('Auto-document captures', aiAutoDoc),
         labeledRow('Ollama host', ollamaHost),
         labeledRow('Ollama model', ollamaModel),
         el('div.row', { style: { justifyContent: 'space-between' } },
@@ -416,7 +418,7 @@ function showSettingsDialog({
           testAiBtn,
         ),
         el('div.muted', {},
-          'AI generation is manual only. Captures stay deterministic until you click a generate button.',
+          'When auto-document is on, each capture is automatically documented by AI. Turn it off to use AI manually only.',
         ),
       ),
       el('fieldset', {},
@@ -465,6 +467,7 @@ function showSettingsDialog({
               ai: {
                 ...settings.ai,
                 enabled: aiEnabled.checked,
+                autoDoc: aiAutoDoc.checked,
                 ollama: {
                   ...(settings.ai?.ollama || {}),
                   host: ollamaHost.value.trim(),