[iOS] "reduce transparency" not respected in community-adding icon

[fluxbug-flutter]

Steps to reproduce

1. turn on "reduce transparency" in your system settings (i'm on ios, unsure what the android equivalent is)
2. navigate to fluxer mobile
3. scroll down on the community list until you see the + icon to add a server. tap it

Expected behaviour

the background should be dimmed or fully blacked out to show the focus is on the community-adding widget in the center of the screen while respecting the user preferring less transparency

Actual behaviour

the background is blurred

Client and system settings

Version 1.0.0, Beta 29, Channel Beta, Build 33, iOS 18.7.8 (arm64), Device iPhone17,1, Locale en-US, Push apns, Flutter 3.44.4, Dart 3.12.2

Stances

Approvals

• CR; esp in light mode. Background just blurs and barely dims. Version 1.0.0, Beta 32, Channel Beta, Build 36, iOS 26.5 (arm64), Device iPhone17,4, Locale en-US, Push apns, Flutter 3.44.5, Dart 3.12.2
• Acceptable & Valid on Beta 39, Build 45.

Denials

None

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Reported: #1104