feat: enable HTML rich messages in Telegram poster

- Strip separator lines (━, —, -, =, etc.) automatically
- Format first line as bold HTML title (<b>Title</b>)
- Keep body text escaped and formatted
- Append hashtags at the end (#category #source)
- Pass parse_mode='HTML' in Telegram API requests

src/vk_parser_app/text_utils.py

@@ -31,12 +31,47 @@ def publication_hashtags(category_tag: str, source_tag: str) -> str:
     return " ".join(f"#{tag}" for tag in tags if tag)
 
 
-def build_publication_text(text: str, category_tag: str, source_tag: str) -> str:
+import html
+
+
+def build_publication_text(
+    text: str,
+    category_tag: str,
+    source_tag: str,
+    format_title: bool = False,
+    parse_mode: str | None = None,
+) -> str:
     base = strip_trailing_hashtag_line(text)
+    lines = base.splitlines()
+    sep_pattern = re.compile(r"^\s*[━—─\-=\*\#_]{2,}\s*$")
+    filtered_lines = [line for line in lines if not sep_pattern.match(line)]
+    if not filtered_lines:
+        return publication_hashtags(category_tag, source_tag)
+    title_idx = None
+    for idx, line in enumerate(filtered_lines):
+        if line.strip():
+            title_idx = idx
+            break
+    formatted_lines = []
+    for idx, line in enumerate(filtered_lines):
+        if idx == title_idx and format_title:
+            if parse_mode == "html":
+                escaped_title = html.escape(line.strip())
+                formatted_lines.append(f"<b>{escaped_title}</b>")
+            elif parse_mode == "markdown":
+                formatted_lines.append(f"**{line.strip()}**")
+            else:
+                formatted_lines.append(line.strip())
+        else:
+            if parse_mode == "html":
+                formatted_lines.append(html.escape(line))
+            else:
+                formatted_lines.append(line)
+    body = "\n".join(formatted_lines).strip()
     hashtags = publication_hashtags(category_tag, source_tag)
-    if not hashtags:
-        return base
-    return f"{base}\n\n{hashtags}" if base else hashtags
+    if hashtags:
+        return f"{body}\n\n{hashtags}" if body else hashtags
+    return body
 
 
 def parse_categories(value: object) -> list[str]:

src/vk_parser_app/workers/tg_poster.py

@@ -159,8 +159,8 @@ class TelegramPoster:
             )
         return sorted(rows, key=lambda row: row["time"])
 
-    def chat_kwargs(self) -> dict[str, int]:
-        kwargs = {"chat_id": int(self.chat_id)}
+    def chat_kwargs(self) -> dict[str, Any]:
+        kwargs: dict[str, Any] = {"chat_id": int(self.chat_id), "parse_mode": "HTML"}
         if self.thread_id:
             kwargs["message_thread_id"] = int(self.thread_id)
         return kwargs
@@ -318,7 +318,7 @@ class TelegramPoster:
     def build_text(self, post: dict[str, Any]) -> str:
         category_tag = str(post.get("final_category_tag") or post.get("rewrite_category_tag") or post.get("final_category") or post.get("rewrite_category") or "")
         source_tag = str(post.get("final_source_tag") or post.get("rewrite_source_tag") or post.get("source_tag") or "")
-        return build_publication_text(post.get("final_text") or post.get("rewritten_text") or "", category_tag, source_tag)
+        return build_publication_text(post.get("final_text") or post.get("rewritten_text") or "", category_tag, source_tag, format_title=True, parse_mode="html")
 
     async def send_text(self, text: str) -> list[int]:
         message_ids: list[int] = []