feat: Adopt refreshed typography in BHCE BED-9083

[justin-prime1]

Summary

• adopt the refreshed DoodleUI typography foundation throughout BHCE
• load Figtree and Nunito Sans through the existing workspace/font-loading path
• align the legacy MUI typography bridge with the approved DoodleUI metrics and semantic light-mode colors
• remove duplicate or conflicting typography overrides and migrate product headings to semantic Typography usage
• retain documented functional exceptions for monospace content, icon glyphs, canvas-rendered graph labels, and context-specific visualization text

Jira

BED-9083: Adopt the DoodleUI typography refresh in BHCE

Dependency

• stacked on feat: Refresh DoodleUI typography foundation BED-9082 #3067
• after feat: Refresh DoodleUI typography foundation BED-9082 #3067 merges, this PR can be retargeted to main

Validation

• just prepare-for-codereview
• DoodleUI and shared UI tests passed
• DoodleUI, shared UI, and BHCE type checks/production builds passed
• authenticated browser validation covered Explore, dialogs, Privilege Zones, light and dark modes, long strings, responsive widths, and blocked-webfont fallback
• representative screenshots are prepared for Theresa's UX review

Known limitation

Privilege Zones has a pre-existing fixed-width content region that clips at a 640 CSS-pixel viewport/200%-zoom equivalent. The document root itself does not overflow because an ancestor clips oversized descendants. Fixing this requires structural responsive-layout work outside this typography story, so the browser harness retains an expected-failure descendant-bounds scenario until the follow-up is completed.

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