feat: improve dashboard header controls

[JustAGhosT]

Summary

• reorganize the primary header into grouped dropdown navigation
• add persisted Airtable and dark/light controls to the header
• refresh the dashboard hero, summary cards, metrics table, and Airtable panel states

Validation

• pnpm run type-check
• pnpm run lint
• pnpm run build
• git diff --check
• Playwright browser verification of header controls and dashboard rendering with local auth seeding

Notes

• Excludes the unrelated Azure workflow change currently present in the local worktree.
• Excludes generated Playwright/output artifacts.

[chatgpt-codex-connector]

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Reviewed commit: 8293365d65

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[chatgpt-codex-connector]

Avoid fetching Airtable when disabled

When omnipost.airtableEnabled is already stored as false, this initial true render still mounts <AirtableIntegration /> for the first commit. Its child useEffect can start the Airtable request before this component's effect reads localStorage and hides the panel, so a user who disabled the header control still spends an Airtable/API-key-backed fetch on every dashboard load. Initialize from storage before rendering the integration, or gate the panel until the stored preference has been loaded.

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