fix ai title generation and remove separate rewrite section

- Remove the standalone "AI Rewrite" section from the editor panel.
  The existing title and description AI buttons already flush the step
  first, so they rewrite whatever the user has typed in those fields.

- Never pass a generic fallback title ("Screen capture", "Window
  capture", "Region capture", "Capture") as the AI title candidate or
  as step content. It is now treated as "(not set — generate a
  specific action title)" so the AI always produces something real.

- hasRichCaptureContext now counts any non-trivial app name or window
  title as sufficient context, instead of requiring non-browser noise.

- Prompt rules updated: "NEVER output Screen/Window/Region capture",
  separate paths for improving a user draft vs generating from context,
  and clearer guidance when context is limited (use app/window name).

- isPlaceholderTitle helper guards summarizeStepForAi so a
  default-titled step presents itself as empty to the AI.

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

app/text-intel.js

@@ -5,6 +5,7 @@ const path = require('node:path');
 const { execFileSync } = require('node:child_process');
 
 const {
+  DEFAULT_CAPTURE_TITLES,
   buildCaptureTitle,
   normalizeOllamaHost,
   normalizeAiPatch,
@@ -14,6 +15,8 @@ const {
   normalizeWhitespace,
 } = require('../core/text-intel');
 
+const DEFAULT_TITLE_VALUES = new Set(Object.values(DEFAULT_CAPTURE_TITLES).concat(['Capture']));
+
 const OCR_CROP = {
   width: 420,
   height: 220,
@@ -430,18 +433,20 @@ public static class Win32 {
       // Use stored capture metadata when available (best context, from capture time).
       // Fall back to re-running OCR on the stored image only when metadata is absent.
       if (step.captureMetadata) {
+        const rawCandidate = buildCaptureTitle({
+          mode: step.captureMetadata.mode || 'fullscreen',
+          metadata: {
+            windowTitle: step.captureMetadata.windowTitle,
+            appName: step.captureMetadata.appName,
+            elementLabel: step.captureMetadata.elementLabel,
+            elementRole: step.captureMetadata.elementRole,
+          },
+          ocrText: step.captureMetadata.ocrText,
+        });
         captureContext = {
           ...step.captureMetadata,
-          titleCandidate: buildCaptureTitle({
-            mode: step.captureMetadata.mode || 'fullscreen',
-            metadata: {
-              windowTitle: step.captureMetadata.windowTitle,
-              appName: step.captureMetadata.appName,
-              elementLabel: step.captureMetadata.elementLabel,
-              elementRole: step.captureMetadata.elementRole,
-            },
-            ocrText: step.captureMetadata.ocrText,
-          }),
+          // Don't suggest a generic fallback title — leave it blank so AI generates from context.
+          titleCandidate: DEFAULT_TITLE_VALUES.has(rawCandidate) ? '' : rawCandidate,
         };
       } else if (step.image) {
         const imagePath = this.store.stepImagePath(guideId, stepId, 'working') || this.store.stepImagePath(guideId, stepId, 'original');
@@ -454,7 +459,7 @@ public static class Win32 {
               this.collectForegroundWindowContext(),
               this.ocrAroundClick({ image, size: image.getSize(), display: { bounds: { x: 0, y: 0, width: image.getSize().width, height: image.getSize().height } } }, clickPoint),
             ]);
-            const titleCandidate = buildCaptureTitle({
+            const rawCandidate2 = buildCaptureTitle({
               mode: step.kind === 'image' ? 'fullscreen' : 'window',
               metadata,
               ocrText: ocr.text,
@@ -462,7 +467,7 @@ public static class Win32 {
             captureContext = {
               ...metadata,
               ocrText: ocr.text,
-              titleCandidate,
+              titleCandidate: DEFAULT_TITLE_VALUES.has(rawCandidate2) ? '' : rawCandidate2,
               mode: step.kind === 'image' ? 'fullscreen' : 'content',
             };
           }