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/app.js

@@ -80,6 +80,18 @@ class StepForgeApp {
 
     api.capture.onAdded((payload) => this.onCaptureAdded(payload));
     api.capture.onState((payload) => this.updateCaptureState(payload));
+    api.capture.onStepUpdated((payload) => this.onStepUpdated(payload));
+  }
+
+  async onStepUpdated(payload) {
+    if (!payload || !payload.guideId || !payload.step) return;
+    if (this.state.view === 'editor' && this.editor.guideId === payload.guideId) {
+      const currentStep = this.editor.currentStep;
+      if (currentStep && currentStep.stepId === payload.step.stepId) {
+        await this.editor.reload(payload.step.stepId);
+        toast('Documentation generated.');
+      }
+    }
   }
 
   async onCaptureAdded(payload) {