Add fallback OG in the event of 404

[mrdarrengriffin]

TSIA

[netlify]

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[Copilot]

Pull request overview

Adds a template-level fallback Open Graph image that is served when the target page fetch fails (e.g., 404), so OG requests can still return a valid image instead of a 500.

Changes:

• Adds fallbackImage support to template configs (starting with the esphome template).
• Introduces loadFallbackImage() in lib/templates.mjs to load and serve the configured fallback asset with an appropriate MIME type.
• Updates both the local dev server and the Netlify function to return the fallback image when the page fetch is not OK or throws.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
templates/esphome/config.json	Declares fallbackImage: "og.webp" for the ESPHome template.
server.mjs	Serves the configured fallback image when /opengraph fetch returns non-OK or errors.
netlify/functions/opengraph.mjs	Mirrors the same fallback behavior in the Netlify OG endpoint.
lib/templates.mjs	Adds loadFallbackImage() to load the configured fallback asset and determine its MIME type.

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