feat: youtube_subs + dashboard includ descrierea video ca index

- tools/youtube_subs.py: get_subtitles() returneaza acum (title, desc, transcript).
  Functii noi is_description_about_video() si extract_relevant_description()
  detecteaza daca descrierea contine capitole/timestamps (nu doar promotie autori)
  si curata trailing-urile promotionale inainte sa includa descrierea in output.
- dashboard/handlers/youtube.py: aceleasi functii adaugate; nota KB generata
  include acum un bloc "Descriere / Index" daca descrierea e relevanta pentru video.
- memory/kb/youtube: nota Jeremy Grantham (AI bubble, investitii, toxicitate)
  cu descrierea ca index de capitole.

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

dashboard/handlers/youtube.py

@@ -36,6 +36,50 @@ def _clean_vtt(content):
     return ' '.join(lines)
 
 
+def _is_description_about_video(description):
+    """Return True if description contains info about the video (chapters/topics)."""
+    if not description or len(description.strip()) < 50:
+        return False
+    timestamp_pattern = re.compile(r'\b\d{1,2}:\d{2}(:\d{2})?\b')
+    if len(timestamp_pattern.findall(description)) >= 3:
+        return True
+    lines = description.strip().split('\n')
+    bullet_lines = [l for l in lines if re.match(r'^\s*[◼•\-\*▶►]\s+\S', l)]
+    if len(bullet_lines) >= 3:
+        return True
+    numbered_lines = [l for l in lines if re.match(r'^\s*\d+[\.\)]\s+\S', l)]
+    if len(numbered_lines) >= 3:
+        return True
+    return False
+
+
+def _extract_relevant_description(description):
+    """Strip promotional tails (links, social media) from description."""
+    if not description:
+        return ""
+    promo_patterns = [
+        re.compile(r'https?://\S+'),
+        re.compile(r'instagram|twitter|facebook|tiktok|linkedin|patreon|spotify', re.I),
+        re.compile(r'follow|subscribe|newsletter|merch|sponsor|affiliate', re.I),
+        re.compile(r'purchase|buy|order|shop|store', re.I),
+    ]
+    result_lines = []
+    promo_streak = 0
+    for line in description.strip().split('\n'):
+        stripped = line.strip()
+        is_promo = any(p.search(stripped) for p in promo_patterns)
+        if is_promo:
+            promo_streak += 1
+            if promo_streak >= 2:
+                break
+        else:
+            promo_streak = 0
+            result_lines.append(line)
+    while result_lines and not result_lines[-1].strip():
+        result_lines.pop()
+    return '\n'.join(result_lines)
+
+
 def _process_youtube(url):
     """Download subtitles, save note."""
     yt_dlp = os.path.expanduser('~/.local/bin/yt-dlp')
@@ -51,6 +95,7 @@ def _process_youtube(url):
     info = json.loads(result.stdout)
     title = info.get('title', 'Unknown')
     duration = info.get('duration', 0)
+    description = info.get('description', '')
 
     temp_dir = Path('/tmp/yt_subs')
     temp_dir.mkdir(exist_ok=True)
@@ -78,6 +123,13 @@ def _process_youtube(url):
     slug = re.sub(r'[^\w\s-]', '', title.lower())[:50].strip().replace(' ', '-')
     filename = f"{date_str}_{slug}.md"
 
+    # Build optional description block
+    desc_block = ""
+    if _is_description_about_video(description):
+        relevant_desc = _extract_relevant_description(description)
+        if relevant_desc:
+            desc_block = f"\n## Descriere / Index\n\n{relevant_desc}\n\n---\n"
+
     note_content = f"""# {title}
 
 **Video:** {url}
@@ -86,7 +138,7 @@ def _process_youtube(url):
 **Tags:** #youtube #to-summarize
 
 ---
-
+{desc_block}
 ## Transcript
 
 {transcript[:15000]}