identity: draw the M3 Expressive theme factory + nav slide from floret-kit

Phase 3 (identity layer). AgendulaTheme is now a thin wrapper over the kit's
FloretExpressiveTheme(lightScheme, darkScheme, …): the shared mechanics
(dynamic colour, light/dark, standard motion scheme) live in floret-kit, while
Agendula keeps its own identity — the seed-derived AgendulaLight/DarkFallback
schemes and AgendulaTypography (unchanged in Color.kt/Type.kt). rememberNavSlideSpec
now comes from the kit; the app's AgendulaTransitions.kt is removed and the
NavHost import repointed. Submodule re-pinned to the identity kit commit.

Clean composite build + tests + lintDebug + debug assemble green; substitution
confirmed (de.jeanlucmakiola.floret:identity -> project :floret-kit:identity).

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

app/build.gradle.kts

@@ -122,6 +122,7 @@ dependencies {
     implementation(libs.kotlinx.coroutines.core)
     implementation("de.jeanlucmakiola.floret:core-time")
     implementation("de.jeanlucmakiola.floret:core-crash")
+    implementation("de.jeanlucmakiola.floret:identity")
 
     debugImplementation(libs.androidx.ui.tooling)
     debugImplementation(libs.androidx.ui.test.manifest)

app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/AgendulaNavHost.kt

@@ -1,5 +1,6 @@
 package de.jeanlucmakiola.agendula.ui.navigation
 
+import de.jeanlucmakiola.floret.identity.rememberNavSlideSpec
 import androidx.compose.animation.EnterTransition
 import androidx.compose.animation.ExitTransition
 import androidx.compose.animation.fadeIn

app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/AgendulaTransitions.kt

@@ -1,21 +0,0 @@
-package de.jeanlucmakiola.agendula.ui.navigation
-
-import androidx.compose.animation.core.FiniteAnimationSpec
-import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.unit.IntOffset
-
-/**
- * The horizontal slide spec for screen-to-screen navigation: the *fast*
- * spring-physics spec from the active motion scheme — snappy with a subtle
- * springy settle, rather than a fixed easing curve. Same choice as Calendula's
- * calendar slide, so the two apps move the same way.
- *
- * Read in composable scope so the non-composable `NavHost` transition lambdas
- * can capture it.
- */
-@OptIn(ExperimentalMaterial3ExpressiveApi::class)
-@Composable
-fun rememberNavSlideSpec(): FiniteAnimationSpec<IntOffset> =
-    MaterialTheme.motionScheme.fastSpatialSpec()

app/src/main/java/de/jeanlucmakiola/agendula/ui/theme/Theme.kt

@@ -1,48 +1,28 @@
 package de.jeanlucmakiola.agendula.ui.theme
 
-import android.os.Build
 import androidx.compose.foundation.isSystemInDarkTheme
-import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
-import androidx.compose.material3.MaterialExpressiveTheme
-import androidx.compose.material3.MotionScheme
-import androidx.compose.material3.dynamicDarkColorScheme
-import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.platform.LocalContext
+import de.jeanlucmakiola.floret.identity.FloretExpressiveTheme
 
 /**
- * App theme. Honors:
- *   - System light/dark.
- *   - Dynamic Color on API 31+, else falls back to the hand-tuned scheme
- *     derived from [AgendulaSeed].
- *
- * Mirrors Calendula's theme: MaterialExpressiveTheme routes all component +
- * custom motion through MaterialTheme.motionScheme. STANDARD over expressive()
- * is the same deliberate choice — spring choreography without the overshoot.
- *
- * A Settings screen can later override dynamicColor and theme mode; the M0
- * foundation just follows the system.
+ * Agendula's theme: the family's [FloretExpressiveTheme] machinery (dynamic
+ * colour on API 31+, system light/dark, the standard motion scheme) fed with
+ * Agendula's own identity — its seed-derived fallback schemes
+ * ([AgendulaLightFallback] / [AgendulaDarkFallback]) and [AgendulaTypography].
+ * The mechanics live in floret-kit; the look stays here.
  */
-@OptIn(ExperimentalMaterial3ExpressiveApi::class)
 @Composable
 fun AgendulaTheme(
     darkTheme: Boolean = isSystemInDarkTheme(),
     dynamicColor: Boolean = true,
     content: @Composable () -> Unit,
 ) {
-    val colorScheme = when {
-        dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
-            val ctx = LocalContext.current
-            if (darkTheme) dynamicDarkColorScheme(ctx) else dynamicLightColorScheme(ctx)
-        }
-        darkTheme -> AgendulaDarkFallback
-        else -> AgendulaLightFallback
-    }
-
-    MaterialExpressiveTheme(
-        colorScheme = colorScheme,
+    FloretExpressiveTheme(
+        lightScheme = AgendulaLightFallback,
+        darkScheme = AgendulaDarkFallback,
+        darkTheme = darkTheme,
+        dynamicColor = dynamicColor,
         typography = AgendulaTypography,
-        motionScheme = MotionScheme.standard(),
         content = content,
     )
 }