fix: update visualizers to use correct spectrum-design-data URLs

[GarthDB]

Summary

Fixes both visualizers to fetch token data from the correct branches in the renamed repository.

Changes

• visualizer: Update to fetch from spectrum-design-data/s1-legacy (was spectrum-tokens/s1-legacy)
• s2-visualizer: Update to fetch from spectrum-design-data/main (was spectrum-tokens/beta)
• s2-visualizer README: Update all references from spectrum-tokens to spectrum-design-data

Issue

After the repository rename, the old URLs were returning 404 errors, preventing both visualizers from loading token data.

Testing

After merge and deployment:

• Visualizer loads data from s1-legacy branch
• S2 Visualizer loads data from main branch

[changeset-bot]

⚠️ No Changeset found

Latest commit: 75679d8

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[GarthDB]

Run report for 75679d8b

Total time: 14.9s | Comparison time: 18.5s | Estimated savings: 3.6s (19.6% faster)

	Action	Time	Status	Info
⬛️	SetupProto(0.51.4)	0ms	Skipped
🟩	SyncWorkspace	6.8ms	Passed
🟩	SyncProject(visualizer)	0.4ms	Passed
🟩	SyncProject(s2-visualizer)	0.4ms	Passed
⬛️	SetupToolchain(node:~20.12)	1.3s	Skipped
🟩	InstallWorkspaceDeps(node:~20.12)	8.4s	Passed
🟩	RunTask(visualizer:typescript)	2.7s	Passed
🟩	RunTask(s2-visualizer:typescript)	2.7s	Passed
🟩	RunTask(s2-visualizer:build)	2.5s	Passed
🟩	RunTask(visualizer:build)	2.5s	Passed

Touched files

docs/s2-visualizer/README.md
docs/s2-visualizer/src/controllers/graph-data-source.ts
docs/visualizer/src/controllers/graph-data-source.ts