fix: added transmitter for ctrl + s

[scolastico]

Description

Provides a not3/draw/save event to tell the parent page to save the file.

Related Issue

Closes not-three/main#19

Screenshots (if applicable)

n/a

Checklist

• I have tested my changes locally
• I have updated the documentation if needed
• This PR follows the project's coding style

Additional Notes

n/a

[github-actions]

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[Copilot]

Pull request overview

Adds a Ctrl/Cmd+S keyboard shortcut to transmit a not3/draw/save message to the embedding parent page so it can persist the current Excalidraw scene.

Changes:

• Add global keydown listener to intercept Ctrl/Cmd+S and post a not3/draw/save message containing the latest elements.
• Track latest Excalidraw elements via a ref updated from onChange.
• Adjust Vite dev server host allowance via server.allowedHosts.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
vite.config.ts	Updates dev server host configuration (allowedHosts).
src/App.tsx	Adds Ctrl/Cmd+S save transmitter and keeps latest elements in a ref for posting to the parent page.

Comments suppressed due to low confidence (1)

src/App.tsx:58

• This postMessage(..., "*") sends the live scene contents to any parent origin. Please restrict targetOrigin to the expected parent origin (same fix as for the save message) to avoid data exposure when embedded by an untrusted site.

            window.parent.postMessage({
              type: "not3/draw/change",
              payload: excalidrawElements,
            }, "*");

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