Align material3 with Compose Multiplatform 1.12.0

The bump to Compose Multiplatform 1.12.0 left material3 at 1.9.0. On
Android those two resolve to incompatible Jetpack artifacts:

  org.jetbrains.compose.foundation:foundation:1.12.0
      -> androidx.compose.foundation:foundation:1.12.0
  org.jetbrains.compose.material3:material3:1.9.0
      -> androidx.compose.material3:material3:1.4.0

Material3 1.4.0 was compiled against the older signature of
androidx.compose.foundation.style.CustomStyle.applyStyle, so composing
any OutlinedTextField now fails with

  java.lang.AbstractMethodError: abstract method
  "void androidx.compose.foundation.style.CustomStyle.applyStyle(
   androidx.compose.foundation.style.CustomStyleScope)" on receiver
  OutlinedTextFieldDefaults$$ExternalSyntheticLambda0

which crashes the app when the settings bottom sheet pages to the AI
provider or More tab. Under 1.11.1 this did not surface because
foundation resolved to androidx foundation 1.11.2.

The compatibility table for Compose Multiplatform 1.12.0 pairs it with
material3 1.12.0-alpha03 (Jetpack Material3 1.5.0-alpha22), which is the
first material3 built against foundation 1.12.x.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TUHLoZtpoBRJeebhbzz6fe

Author: claude

gradle/libs.versions.toml

@@ -33,7 +33,7 @@ jsJodaTimezone = "2.18.2"
 kotlinxSerialization = "1.11.0"
 ksafe = "3.0.0"
 logback = "1.6.3"
-material3 = "1.9.0"
+material3 = "1.12.0-alpha03"   # must match composeMultiplatform, see https://github.com/JetBrains/compose-multiplatform/blob/master/CHANGELOG.md
 materialKolor = "5.0.0"
 workRuntimeKtx = "2.11.2"
 materialIconsExtended = "1.7.3"