Fonts: Hard-code fonts to open-sans and optimize loading

[dabrorius]

Why

We want to improve performance of fonts loading on booking page. This PR does a few different things:

1. We remove Liquid settings for fonts. These are not reachable by the user as we do not allow customization of booking page. Instead we hard-code the "Open Sans" font directly.
2. We drop the | font_link filter and build our own loading links that are non-blocking.
3. We make sure to load only font weights that we use, and to only use the loaded font weights.

Links

Resolves SC-3033

Media

[dabrorius]

Weights 500 and 800 are mentioned, but they were never loaded. We only loaded 400,600,700,400i,600i,700 through the font_link filter.
They would fall back to the closest fall weight silently. Now we explicitly use the font weight that exists.

[Copilot]

Pull request overview

This PR hard-codes the theme’s typography to Open Sans and refactors font loading to be more performant by replacing theme font settings and font_link with explicit, non-blocking Bunny font links.

Changes:

• Removed font picker settings and hard-coded --font-heading / --font-body to "Open Sans".
• Replaced font_link usage with manual preconnect, preload (woff2), and non-blocking stylesheet loading.
• Updated CSS font-weight usage to align with the reduced set of loaded weights (removing medium/extrabold usage).

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
snippets/form.liquid	Switches form fields to use var(--font-body) instead of theme font settings.
snippets/fonts.liquid	Implements manual Bunny font loading with preload + non-blocking stylesheet.
snippets/color-palette-styles.liquid	Hard-codes --font-heading and --font-body to Open Sans.
layout/theme.liquid	Moves font loading into the head (no longer passes settings into fonts).
layout/session.liquid	Moves font loading into the head (no longer passes settings into fonts).
layout/minimal.liquid	Moves font loading into the head (no longer passes settings into fonts).
layout/checkout.liquid	Moves font loading into the head (no longer passes settings into fonts).
config/settings_schema.json	Removes Typography section (font pickers).
config/settings_data.json	Removes stored heading_font / body_font settings.
assets/product.css	Adjusts product name weight to avoid the removed “medium” variable.
assets/image-banner.css	Adjusts banner title weight to avoid the removed “extrabold” variable.
assets/core.min.css	Regenerates minified core CSS to reflect updated font-weight variables/usage.
assets/base.css	Removes unused font-weight variables (medium, extrabold).

Files not reviewed (1)

• assets/core.min.css: Generated file

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