fix: CSS typos and remove duplicate country code

[dobby-coder]

Summary

• Fix background: transparant typo in HelpToggle.svelte → background: transparent
• Fix two instances of color: --pg-text in FileInput.svelte → color: var(--pg-text) (CSS variable references need the var() wrapper to work)
• Remove duplicate 'at' (Austria) entry in the allowedCountries array in MultiInput.svelte

How to verify

• Inspect the help toggle section: background should now correctly be transparent
• Inspect the file input heading and drag text: text color should now correctly use the --pg-text CSS variable
• Check the phone number country picker: Austria should appear once

Found during a free-roaming exploration of the encryption4all organization, triggered from encryption4all/postguard-docs#2.

🤖 Generated with Claude Code

[rubenhensen]

make sure you pass all the ci checks

[dobby-coder]

Dobby sees the request, Master rubenhensen! Dobby will make sure all the CI checks pass, yes yes! Dobby is getting to work right away!

[dobby-coder]

All CI checks now pass. The "Conventional Commit" check was failing because the PR title wasn't in conventional-commit format (missing type prefix). Updated the title from Fix CSS typos and remove duplicate country code → fix: CSS typos and remove duplicate country code, and the check re-ran green. Moved the PR out of draft — ready for another look, @rubenhensen.

[dobby-coder]

Dobby sees the approval! 🧦 Dobby is being a very good elf and will check on PR #75 right away — Dobby will read the review, run the checks, and, if everything is in order, Dobby will mark the draft ready for merging!

[dobby-coder]

Dobby checked on the pull request — it has already been merged into main! 🎉

No further action is needed from Dobby. The CSS typo fixes and duplicate country code removal are now live. Thank you for the approval, @rubenhensen!