feat: expose --appsmith-theme-fontFamily

[devin-ai-integration]

Exposed font family variable like other theme vars.

This PR exposes the font family as a CSS variable (--appsmith-theme-fontFamily) to custom widgets, following the same pattern as other theme variables like --appsmith-theme-primaryColor. Key changes:

1. Added font-family CSS variable to reset.css for consistent font inheritance
2. Ensures custom widgets use the dynamically selected theme font
3. The fonts have to be downloaded separately inside the custom widget to make it work.

Link to Devin run: https://app.devin.ai/sessions/b301ccf5b4b54ae1aa7e3b4cf2930928

Fixes #38680

Automation

/ok-to-test tags="@tag.Widget"

🔍 Cypress test results

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Workflow run: https://github.com/appsmithorg/appsmith/actions/runs/12823827204
Commit: dc00483
Cypress dashboard.
Tags: @tag.Widget
Spec:

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Fri, 17 Jan 2025 07:45:02 UTC

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[devin-ai-integration]

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[Nikhil-Nandagopal]

/build-deploy-preview skip-tests=true

[github-actions]

Deploying Your Preview: https://github.com/appsmithorg/appsmith/actions/runs/12807708525.
Workflow: On demand build Docker image and deploy preview.
skip-tests: true.
env: ``.
PR: 38700.
recreate: .

[github-actions]

Deploy-Preview-URL: https://ce-38700.dp.appsmith.com

[rahulbarwal]

/build-deploy-preview skip-tests=true

[github-actions]

Deploying Your Preview: https://github.com/appsmithorg/appsmith/actions/runs/12824156267.
Workflow: On demand build Docker image and deploy preview.
skip-tests: true.
env: ``.
PR: 38700.
recreate: .

[github-actions]

Deploy-Preview-URL: https://ce-38700.dp.appsmith.com