Fix QR code blurriness: update SharingEntryLink and AuthTokenSetupDialog

[ItsYash1421]

• Resolves: [Bug]: The QR codes for external sharing are a blurry #57045

Summary

Fixed blurry QR code rendering for external sharing by adding CSS image-rendering properties to ensure crisp display of QR codes. The QR code images now use pixelated/crisp-edges rendering to prevent browser interpolation that was causing the blurriness.

TODO

• TO fix the QR codes for external sharing are a blurry

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• [] Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
  Before:

After:

• [] Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[susnux]

There are no such props, there is only the options prop:
https://github.com/fengyuanchen/vue-qrcode/blob/main/src/README.md

[github-actions]

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