fix(core): block pointer input on frozen slide previews

[ridemountainpig]

What

Adds a pointer-blocking overlay to SlideCanvas when freezeMotion is set, so interactive slide content can no longer hijack clicks meant for the thumbnail and overview surfaces.

Why

In frozen previews (thumbnails, overview), interactive content inside a slide could capture pointer events, swallowing clicks that should select/navigate the slide.

Change

• Render an aria-hidden absolutely-positioned overlay (z-10) over the canvas only when freezeMotion is true.

🤖 Generated with Claude Code

Summary by CodeRabbit

Bug Fixes

• Pointer input is now blocked on frozen slide previews, preventing interactive content from hijacking thumbnail and overview clicks.

[vercel]

@ridemountainpig is attempting to deploy a commit to the Yiwei Ho Team on Vercel.

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[coderabbitai]

Note

Currently processing new changes in this PR. This may take a few minutes, please wait...

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 977400de-d80d-4a72-840b-0ca385ff8b7c

📥 Commits

Reviewing files that changed from the base of the PR and between 0128ba4 and 1009d2f.

📒 Files selected for processing (2)

• .changeset/thumbnail-pointer-shield.md
• packages/core/src/app/components/slide-canvas.tsx

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