WORK-027 — CDN Image Variants

Feature: (utility parity with webapp image-url.js; no FEAT required) Status: Complete

Tasks

1. Add getCdnImageUrl matching webapp logic
- Files: lib/utils/image_url.dart, test/utils/image_url_test.dart
2. Apply variants at image load sites
- App icons → icon / stack tiles → iconsm
- Screenshot thumbs → thumbsm, lightbox → thumblg
- Profile/avatar widgets apply icon/iconsm when on CDN (no-op otherwise)
3. Self-review against INVARIANTS.md

Test Coverage

Scenario	Expected	Status
CDN URL + variant	`?class=<variant>` appended	[x]
Existing query params	Preserved, `class` set	[x]
Non-CDN / relative / null	Unchanged	[x]

Decisions

2026-07-16 — Port webapp CDN class param

Context: Webapp requests sized variants via ?class= on cdn.zapstore.dev. Decision: Same helper and call-site mapping in the Flutter app. Rationale: Smaller transfers for list icons and screenshot thumbs; no-op for other hosts.

Progress Notes

Mirroring webapp/src/lib/utils/image-url.js.

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