chore: add changeset and server-changes for AI prompt management

Author: ericallam

.changeset/ai-prompt-management.md

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+---
+"@trigger.dev/sdk": patch
+---
+
+Define and manage AI prompts with `prompts.define()`. Create typesafe prompt templates with variables, resolve them at runtime, and manage versions and overrides from the dashboard without redeploying.

.server-changes/ai-prompt-management.md

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+---
+area: webapp
+type: feature
+---
+
+AI prompt management dashboard and enhanced span inspectors.
+
+**Prompt management:**
+- Prompts list page with version status, model, override indicators, and 24h usage sparklines
+- Prompt detail page with template viewer, variable preview, version history timeline, and override editor
+- Create, edit, and remove overrides to change prompt content or model without redeploying
+- Promote any code-deployed version to current
+- Generations tab with infinite scroll, live polling, and inline span inspector
+- Per-prompt metrics: total generations, avg tokens, avg cost, latency, with version-level breakdowns
+
+**AI span inspectors:**
+- Custom inspectors for `ai.generateText`, `ai.streamText`, `ai.generateObject`, `ai.streamObject` parent spans
+- `ai.toolCall` inspector showing tool name, call ID, and input arguments
+- `ai.embed` inspector showing model, provider, and input text
+- Prompt tab on AI spans linking to prompt version with template and input variables
+- Compact timestamp and duration header on all AI span inspectors
+
+**AI metrics dashboard:**
+- Operations, Providers, and Prompts filters on the AI Metrics dashboard
+- Cost by prompt widget
+- "AI" section in the sidebar with Prompts and AI Metrics links
+
+**Other improvements:**
+- Resizable panel sizes now persist across page refreshes
+- Fixed `<div>` inside `<p>` DOM nesting warnings in span titles and chat messages