chore: increase sidebar width + remove docs sub-section (#2265)

**Sidebar before**
<img width="255" height="263" alt="Screenshot 2026-01-20 at 14 56 11"
src="https://github.com/user-attachments/assets/923b1463-5fcd-4662-9c65-35f410051475"
/>

**Sidebar after**
<img width="263" height="249" alt="Screenshot 2026-01-20 at 14 58 53"
src="https://github.com/user-attachments/assets/0eadbc36-2379-49ed-abcb-8ec7aae7df4d"
/>

Author: joeyorlando

docs/pages/platform-costs-and-limits.md

@@ -47,20 +47,8 @@ Automatically switch to cheaper models based on conditions:
 
 Rules apply by priority order with configurable target models.
 
-## Integration
-
-**OpenTelemetry Export**
-Export metrics to Prometheus, Datadog, New Relic
-
-**REST API**
-```bash
-GET /api/costs/statistics?period=7d
-GET /api/costs/limits
-POST /api/costs/optimization-rules
-```
-
 ## Related Documentation
 
 - [Profiles Configuration](platform-profiles)
 - [Observability](platform-observability)
-- [Deployment](platform-deployment)
+- [Deployment](platform-deployment)

platform/frontend/src/components/ui/sidebar.tsx

@@ -26,7 +26,7 @@ import { cn } from "@/lib/utils";
 
 const SIDEBAR_COOKIE_NAME = "sidebar_state";
 const SIDEBAR_COOKIE_MAX_AGE = 60 * 60 * 24 * 7;
-const SIDEBAR_WIDTH = "14.5rem";
+const SIDEBAR_WIDTH = "15rem";
 const SIDEBAR_WIDTH_MOBILE = "18rem";
 const SIDEBAR_WIDTH_ICON = "3rem";
 const SIDEBAR_KEYBOARD_SHORTCUT = "b";