good-first: title tooltips on truncated analytics panel labels

[unjica]

Summary

Truncated labels in analytics panels and settings nav lack title fallbacks when text is clipped.

File(s)

• apps/dashboard/app/components/dashboard/ErrorsTopTypesPanel.tsx
• apps/dashboard/app/components/dashboard/EventsPlatformDonut.tsx
• apps/dashboard/app/components/dashboard/SessionsPlatformDonut.tsx
• apps/dashboard/app/components/dashboard/settings/SettingsNav.tsx
• Reference: OverviewTopBars.tsx (existing title={row.label} pattern)

Tasks

• Add title={fullText} on truncating elements
• Scope: panels and nav only — list tables are covered by good-first: add title tooltips on truncated event and error names in tables #310

Acceptance criteria

• Hover shows full text when truncated
• No API/schema changes
• pnpm lint && pnpm test && pnpm build pass

Base branch

Open PRs against develop. See CONTRIBUTING.md.