Fix: estimate preset dimensions

[Kr1491]

Description

PRESET_DIMENSIONS in src/lib/exportEstimate.ts used keys like "1080p", "720p", "square-1080" which don't match any actual preset IDs in src/lib/presets.ts. This caused getOutputDimensions() to always fall back to 1920×1080, making the export size estimate wrong for every preset except Landscape 16:9.

Fixed by updating all keys to match the actual preset IDs and adding all missing presets.

Related Issue

Closes #1156

Type of Contribution

• Bug fix
• New feature
• Documentation update
• Refactor
• GSSoC contribution

Participant Info

• GitHub username: @Kr1491
• Contribution level (Beginner/Intermediate/Advanced): Intermediate

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• I have read the contribution guidelines
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• bun run lint passes (no ESLint errors)
• bunx tsc --noEmit passes (no TypeScript errors)
• New interactive elements have aria-label / accessible names
• No console.log statements left in
• This PR is related to a valid issue

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[github-actions]

👋 Thanks for your PR, @Kr1491!

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🟠 GSSoC'26 PR detected — thanks for contributing under GirlScript Summer of Code 2026!

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[github-actions]

✅ PR Format Check Passed — @Kr1491

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[Kr1491]

Hi @magic-peach ! can you look into this pr, thank you !

[Kr1491]

hey @magic-peach can you please look into this pr, thank you !