feat: add Tokyo Three Speeds artifact, remove Patch Handoff Workbench

This commit introduces the complete Tokyo Three Speeds travel planning artifact:
- Adds 4 new scenic photos to the public asset folder
- Implements full component set for the 3-day Tokyo travel guide
- Adds source attribution and media credit system
- Removes the entire Patch Handoff Workbench artifact and all its supporting code
- Updates favicon references across docs and demo build
- Fixes documentation path reference from DESIGN.md to TASTE.md
- Updates test cases for demo build output

Author: Sayhi-bzb

agent-html/artifacts/README.md

@@ -9,7 +9,7 @@ Use it after reading `../README.md` and `../AGENTS.md`. `AGENTS.md` owns hard ar
 - New artifact or broad artifact edit: start from `../examples/example.artifact.tsx`.
 - Existing split artifact: open the `*.artifact.tsx` artifact entry before opening block files.
 - Large block file: read `../index/large-files.md`, the artifact entry, and the block name first, then open only the block that owns the requested change.
-- UI choice: read `../components/README.md`, then `../../taste/design/DESIGN.md` for component judgment.
+- UI choice: read `../components/README.md`, then `../TASTE.md` for component judgment.
 - Reusable hooks, helpers, schemas, data, or rich components: read `../index/reuse-surface.md`, then `../index/api-surface.md`, before adding local code.
 
 ## Boundary

agent-html/artifacts/nasa-artemis-ii/source-links.tsx

@@ -1,5 +1,3 @@
-import { ExternalLinkIcon } from "lucide-react"
-
 import type { SourceLink } from "./data"
 
 export function SourceLinks({ links }: { links: SourceLink[] }) {
@@ -13,7 +11,6 @@ export function SourceLinks({ links }: { links: SourceLink[] }) {
           rel="noreferrer"
           target="_blank"
         >
-          <ExternalLinkIcon data-icon="inline-start" />
           <span className="canvas-text-caption">{link.label}</span>
         </a>
       ))}