fix: localize chart UI and stream blockquotes

[zhangxy-zju]

Summary

• add shared partial labels overrides across core, React, Vue, and markdown-it
• localize Chart/Data accessibility labels, empty/truncated data messages, and adapter error fallbacks
• recognize closed chart fences inside streaming blockquotes without accepting mismatched container depth
• document the new API and add a patch changeset

Fixes #34
Fixes #35

Validation

• pnpm test (272 tests)
• pnpm typecheck
• pnpm build
• pnpm dlx pnpm@10.27.0 check:pack
• git diff --check