refactor(shadcn): share agent token logic between Vercel route and dev server

[thomasyuill-livekit]

Issue

Addresses reviewer feedback on merged PR #1394 — no Linear ticket for this follow-up.

Overview

• The AgentSessionView-01 story needs a LiveKit token from two places: a Vercel Preview API route and a local Storybook dev-server middleware.
• Both had duplicated token-minting logic, risking future updates being applied to only one copy.
• Extracted the shared "core" into one TypeScript module, used by both.

Summary of changes

File	Change
docs/storybook/api/agents-ui/tokenCore.ts	New. Shared createAgentToken(env) — env validation, AccessToken + RoomConfiguration construction.
docs/storybook/api/agents-ui/token.ts	Vercel route now just calls createAgentToken and sends the response.
docs/storybook/.storybook/main.js	Dev middleware loads tokenCore.ts via Vite's server.ssrLoadModule (needed since this file is CommonJS and can't natively import TS), then calls createAgentToken.

Testing

• pnpm --filter @livekit/component-docs-storybook tsx:check passes on all touched/new files.
• Ran pnpm dev:storybook locally and confirmed the token route still executes end-to-end through the new shared module (returns the expected validation error without LIVEKIT_URL set).
• Once this PR's Vercel Preview deploys, verify the AgentSessionView-01 story still connects to a live room at <preview-url>/?path=/story/agents-ui-agentsessionview-01--default.

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
components-js-storybook-5kld	Ready	Preview, Comment	Jul 23, 2026 3:20pm

[github-actions]

size-limit report 📦

Path	Size
LiveKitRoom only	7.89 KB (0%)
LiveKitRoom with VideoConference	32.52 KB (0%)
All exports	44.13 KB (0%)