chore: add inherit option for survery font customization

[lucasheriques]

Problem

Depends on PostHog/posthog-js#1763

Adds the option to inherit font family on Surveys.

It's the one that probably makes more sense for customers - uses the same font as their website.

Has one TODO before merging: adding the minimum version to use this feature. Will be done once the SDK PR is merged and I know the version.

Does this work well for both Cloud and self-hosted?

yes

How did you test this code?

verified locally if font family is being updated

[greptile-apps]

PR Summary

Added an 'inherit' font family option to surveys, allowing users to match their website's font for better integration.

• Added inherit option to WEB_SAFE_FONTS in /frontend/src/scenes/surveys/constants.tsx, changing from string array to objects with value and label properties
• Updated SurveyAppearance type in /frontend/src/types.ts to use the new structure with fontFamily: (typeof WEB_SAFE_FONTS)[number]['value']
• Added .inherit CSS class in /frontend/src/styles/base.scss that sets font-family: inherit
• Updated font family selection UI in /frontend/src/scenes/surveys/SurveyCustomization.tsx with a TODO to specify minimum posthog-js version required

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[github-actions]

Size Change: -132 B (0%)

Total Size: 9.72 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	9.72 MB	-132 B (0%)

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