enh(frontend): use light background for infra icons

[julestree]

How to categorize this PR?

/area usability
/kind enhancement

What this PR does / why we need it:
Adds a light background color to the infra icons so that they are easily visible in dark mode.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

NONE

Screenshots:

Before:

After:

Summary by CodeRabbit

• Style
  • Improved dark-mode vendor icon visibility by applying a consistent light background color.

[gardener-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 79859730-c4ed-40a0-a8ec-b310bbf2c4d1

📥 Commits

Reviewing files that changed from the base of the PR and between e467be2 and 4e02e3b.

📒 Files selected for processing (1)

• frontend/src/components/GVendorIcon.vue

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📝 Walkthrough

Walkthrough

The vendor icon component’s dark-theme background now uses the fixed color #e0e0e0, replacing the Vuetify grey palette lookup and removing the associated Sass imports.

Changes

Vendor icon theme styling

Layer / File(s)	Summary
Dark-theme background color frontend/src/components/GVendorIcon.vue	The dark-theme .icon-background style uses #e0e0e0 instead of a Vuetify palette lookup, and unused Sass imports are removed.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: grolu

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the change by describing the new lighter background for infra icons.
Description check	✅ Passed	The description mostly follows the template with categorization, purpose, and release note filled in; only the issue reference is incomplete.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/frontend-vendor-icon-background

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