Fix: remove duplicate component imports breaking production build

[webgo-oss]

Problem

npm run build fails outright with an esbuild syntax error and never produces a production bundle:

[vite:esbuild] Transform failed with 1 error:
ERROR: The symbol "ExifMetadataInspector" has already been declared

Three page components each import the same child component twice at the top level. esbuild treats a duplicate top-level binding as a hard syntax error, not a warning — so the build fails completely rather than just showing a lint warning.

npm run dev doesn't catch this (looser dev-server transform), which is likely why it went unnoticed until someone tried a production build.

Root cause

Duplicate import statements for the same component in:

• frontend/src/pages/UploadPage.jsx — ExifMetadataInspector
• frontend/src/pages/EditorPage.jsx — PresetFilterManager
• frontend/src/pages/PrintPreviewPage.jsx — CustomPaperSizeCalculator

Fix

Removed the redundant second import line in each file. No logic changes — the components are still used exactly as before via their first (original) import.

Testing

cd frontend
npm install
npm run build

Build now completes successfully (built in ~13s), no esbuild errors.

Changes

• 3 files changed
• 3 lines removed
• 0 lines added
• No behavior change — this is a pure build-fix, safe to merge immediately.

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[souma9830]

Open source programme name @webgo-oss