docs(ai): Update AI dashboards with shared includes and new AI Spans view (#17183)

## DESCRIBE YOUR PR

Update AI agents dashboard docs to reflect UI changes and create shared
includes for single source of truth.

- Create shared includes at `includes/ai-dashboards/` used by both
`/ai/monitoring/agents/dashboards/` and
`/product/dashboards/sentry-dashboards/ai/agents/`
- Replace "Abbreviated Trace View" (drawer) with new "AI Spans View" tab
in Trace Explorer
- Rename `dashboard.mdx` → `dashboards.mdx` (plural, individual
dashboards now)
- Update all cross-references (6 platform pages + costs.mdx) and add
redirect from old path
- Optimize new screenshot with pngquant (470K → 124K)
- Remove 14 old duplicate images

Closes https://linear.app/getsentry/issue/DEVEX-419

## IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs
to go live.
- [ ] Urgent deadline (GA date, etc.):
- [ ] Other deadline: April 3, 2026
- [x] None: Not urgent, can wait up to 1 week+

## SLA

- Teamwork makes the dream work, so please add a reviewer to your PRs.
- Please give the docs team up to 1 week to review your PR unless you've
added an urgent due date to it.
Thanks in advance for your help!

## PRE-MERGE CHECKLIST

*Make sure you've checked the following before merging your changes:*

- [ ] Checked Vercel preview for correctness, including links
- [ ] PR was reviewed and approved by any necessary SMEs (subject matter
experts)
- [ ] PR was reviewed and approved by a member of the [Sentry docs
team](https://github.com/orgs/getsentry/teams/docs)

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sergical

docs/ai/monitoring/agents/costs.mdx

@@ -4,7 +4,7 @@ sidebar_order: 15
 description: Learn how Sentry calculates AI model costs, where pricing data comes from, and what's not covered.
 ---
 
-The **Model Cost** widget in the [AI Agents Dashboard](/ai/monitoring/agents/dashboard/) Models tab shows estimated costs for your LLM usage. This page explains how those costs are calculated.
+The **Model Cost** widget in the [AI Agents Dashboard](/ai/monitoring/agents/dashboards/) Models tab shows estimated costs for your LLM usage. This page explains how those costs are calculated.
 
 ## Data Sources
 

docs/ai/monitoring/agents/dashboard.mdx

@@ -0,0 +1,41 @@
+---
+title: AI Agents Dashboards
+sidebar_order: 10
+description: Learn how to use Sentry's AI Agents Dashboards.
+keywords:
+  - AI dashboards
+  - agent dashboard
+  - LLM traces
+  - token usage
+  - tool calls
+  - agent insights
+og_image: /og-images/ai-monitoring-agents-dashboard.png
+---
+
+The AI Agents [Dashboards](https://sentry.io/orgredirect/organizations/:orgslug/dashboards/) provide a comprehensive view of your AI workflows, including executions, model costs and token usage, tool calls, and recent errors. Once you've [configured the Sentry SDK](/ai/monitoring/agents/getting-started/) for your AI agent project, telemetry data is collected and displayed in the dashboard to support analysis of system behavior and performance.
+
+AI Agent monitoring have three dashboards:
+
+- [Overview](#overview)
+- [Models](#models)
+- [Tools](#tools)
+
+## Overview
+
+<Include name="ai-dashboards/overview" />
+
+## Models
+
+<Include name="ai-dashboards/models" />
+
+## Tools
+
+<Include name="ai-dashboards/tools" />
+
+## AI Spans View
+
+<Include name="ai-dashboards/ai-spans-view" />
+
+## Detailed Trace View
+
+<Include name="ai-dashboards/detailed-trace-view" />