fix(dashboard): support white-label app branding

[christso]

Summary

Dashboard now defaults its visible app brand to agent v instead of the old Studio label, with the default v rendered in cyan using the landing page's terminal-style monospace treatment.

Projects can white-label the Dashboard by setting dashboard.app_name in .agentv/config.yaml, and teams can set a global fallback in $AGENTV_HOME/config.yaml or ~/.agentv/config.yaml. Project-local config wins over the global value, and the Dashboard API exposes the value as app_name to keep the JSON wire format snake_case.

Verification

• bun test apps/cli/test/commands/results/studio-config.test.ts apps/cli/test/commands/results/serve.test.ts
• bunx biome check apps/cli/src/commands/results/studio-config.ts apps/cli/src/commands/results/serve.ts apps/cli/test/commands/results/studio-config.test.ts apps/cli/test/commands/results/serve.test.ts apps/dashboard/src/components/BrandName.tsx apps/dashboard/src/components/Layout.tsx apps/dashboard/src/components/Sidebar.tsx apps/dashboard/src/lib/api.ts apps/dashboard/src/lib/types.ts apps/dashboard/src/routes/settings.tsx apps/dashboard/src/styles/globals.css apps/web/src/content/docs/docs/tools/dashboard.mdx
• cd apps/dashboard && bun run build
• Pre-push hook passed: build, typecheck, lint, test, validate eval YAML files
• Manual UAT: AGENTV_HOME/config.yaml with dashboard.app_name: ai evals returned app_name: "ai evals" from /api/config and rendered ai evals in the sidebar
• Manual UAT: empty global config returned app_name: "agent v" from /api/config and rendered agent v with the v in cyan

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