ci: force-refresh all snapshots in visual-baseline update

test:visual:update used the default --update-snapshots (=changed), which
skips snapshots that still pass within tolerance. A sub-threshold UI change
(e.g. the class editor's new Class type select) therefore left the how-to-use
modal images stale — they rendered old UI but never got rewritten. Use
--update-snapshots=all so the baseline job is authoritative.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: FelixTJDietrich

standalone/webapp/package.json

@@ -26,7 +26,7 @@
     "test:perf": "node node_modules/@playwright/test/cli.js test --project=perf",
     "test:perf:firefox": "PLAYWRIGHT_FIREFOX=1 node node_modules/@playwright/test/cli.js test --project=perf-firefox",
     "test:visual": "node node_modules/@playwright/test/cli.js test tests/visual/",
-    "test:visual:update": "node node_modules/@playwright/test/cli.js test tests/visual/ --update-snapshots",
+    "test:visual:update": "node node_modules/@playwright/test/cli.js test tests/visual/ --update-snapshots=all",
     "capacitor:add:android": "cap add android",
     "capacitor:add:ios": "cap add ios --packagemanager CocoaPods",
     "capacitor:sync": "cap sync",