fix(components): match full-screen picker bar icons to the runtime theme

A Compose Dialog owns its own Window whose status/navigation-bar icon
appearance is seeded from the XML theme, not from the host activity's
runtime edge-to-edge state. With decorFitsSystemWindows = false the
FullScreenPicker draws under the bars, exposing icons that don't match
the active theme — dark icons on a dark picker (near-invisible), and the
mirror-image nav-bar bug in light theme.

Expose the resolved light/dark decision from FloretExpressiveTheme as
LocalFloretDarkTheme and drive the dialog window's
isAppearanceLight{Status,Navigation}Bars from it, so the appearance
tracks the in-app light/dark choice even when it diverges from the
system night resource qualifier.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

components/build.gradle.kts

@@ -39,6 +39,8 @@ dependencies {
     // core-locale backs the language-picker recipe (AppLanguage).
     implementation(project(":core-locale"))
 
+    implementation(libs.androidx.core.ktx)
+
     implementation(platform(libs.androidx.compose.bom))
     implementation(libs.androidx.ui)
     implementation(libs.androidx.foundation)