[dashboard-language] Security, privacy, accessibility: DLS-SAFE-009 non-color chart semantics

Summary

• milestone: Security, privacy, accessibility
• implement DLS-SAFE-009 for custom chart views by rendering explicit textual color-category legends alongside the existing tabular equivalent
• add unit and browser coverage for visible non-color chart semantics

Specification coverage

• Section 13
• Requirement identifiers: DLS-SAFE-009

Gates

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npm run test:e2e ✅

Blockers

• None in this increment

Next milestone

• Security, privacy, accessibility: additional consuming-context authorization-boundary behavior once the runtime context contract is specified

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