fix: resolve dashboard lint issues

[zhangzhenghao]

Summary

• Run Vue CLI lint auto-fixes across the dashboard codebase
• Resolve remaining lint errors for props, equality checks, unused code, prop mutation, target blank links, and test imports
• Add scoped accessibility lint disables where Shards Vue custom form controls trigger false positives

Test Plan

• pnpm lint
• pnpm test --runInBand
• pnpm build