Enhance Telegram bot UI with YTD comparison, 12-month evolution, and improved navigation

- Add YTD year-over-year comparison table for cash flow evolution
- Extend monthly evolution from 6 to 12 months with dynamic year extraction
- Simplify monthly view to show only Net values aligned with YTD table
- Upgrade client/supplier display from Top 5 to Top 10 with alphabetical sorting
- Remove Refresh and Export buttons from dashboard and evolution views
- Add get_trends() API method for 12-month historical data from backend
- Fix default years to 2025/2024 for accurate YTD calculations

Changes:
- client.py: New get_trends() method calls /api/dashboard/trends endpoint
- helpers.py: Rewrite get_cashflow_evolution_data() to use trends and calculate YTD
- formatters.py: Complete redesign with YTD table and simplified 12-month Net view
- menus.py: Alphabetical sorting for clients/suppliers, removed refresh buttons
- handlers.py: Disabled refresh/export buttons on dashboard and evolution views

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

reports-app/telegram-bot/app/api/client.py

@@ -407,6 +407,38 @@ class BackendAPIClient:
             logger.error(f"Failed to get monthly flows for company {company_id}: {e}")
             return None
 
+    async def get_trends(
+        self,
+        company_id: int,
+        jwt_token: str,
+        period: str = "12m"
+    ) -> Optional[Dict[str, Any]]:
+        """
+        Get trends data (12-month historical data for collections/payments).
+
+        Args:
+            company_id: Company ID
+            jwt_token: JWT access token
+            period: Period for trends (e.g., "12m", "6m", "ytd")
+
+        Returns:
+            Dict with trends data including periods, clienti_incasat, furnizori_achitat arrays
+        """
+        try:
+            if not self.client:
+                self.client = AsyncClient(base_url=self.base_url, timeout=REQUEST_TIMEOUT)
+
+            response = await self.client.get(
+                f"/api/dashboard/trends?company={company_id}&period={period}",
+                headers=self._get_auth_headers(jwt_token)
+            )
+
+            return await self._handle_response(response)
+
+        except Exception as e:
+            logger.error(f"Failed to get trends for company {company_id}: {e}")
+            return None
+
     # =========================================================================
     # INVOICES ENDPOINTS
     # =========================================================================