feat: add EmptyState, ErrorState, and SkeletonCard shared components

composeApp/src/commonMain/kotlin/ch/parano/myicek/ui/components/EmptyState.kt

@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// MyIce Kotlin Multiplatform — schedule/convocation viewer
+// Copyright (C) 2026  parano.ch
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package ch.parano.myicek.ui.components
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.dp
+import ch.parano.myicek.ui.theme.Dimens
+
+@Composable
+fun EmptyState(
+    icon: ImageVector,
+    title: String,
+    message: String,
+    modifier: Modifier = Modifier,
+) {
+    Column(
+        modifier = modifier.fillMaxSize(),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center,
+    ) {
+        Icon(
+            imageVector = icon,
+            contentDescription = null,
+            modifier = Modifier.size(48.dp),
+            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+        Spacer(Modifier.height(Dimens.md))
+        Text(
+            text = title,
+            style = MaterialTheme.typography.titleMedium,
+            color = MaterialTheme.colorScheme.onSurface,
+        )
+        Spacer(Modifier.height(Dimens.sm))
+        Text(
+            text = message,
+            style = MaterialTheme.typography.bodyMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+    }
+}

composeApp/src/commonMain/kotlin/ch/parano/myicek/ui/components/ErrorState.kt

@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// MyIce Kotlin Multiplatform — schedule/convocation viewer
+// Copyright (C) 2026  parano.ch
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package ch.parano.myicek.ui.components
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.Button
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.dp
+import ch.parano.myicek.ui.theme.Dimens
+
+@Composable
+fun ErrorState(
+    icon: ImageVector,
+    title: String,
+    message: String,
+    onRetry: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Column(
+        modifier = modifier.fillMaxSize(),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center,
+    ) {
+        Icon(
+            imageVector = icon,
+            contentDescription = null,
+            modifier = Modifier.size(48.dp),
+            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+        Spacer(Modifier.height(Dimens.md))
+        Text(
+            text = title,
+            style = MaterialTheme.typography.titleMedium,
+            color = MaterialTheme.colorScheme.onSurface,
+        )
+        Spacer(Modifier.height(Dimens.sm))
+        Text(
+            text = message,
+            style = MaterialTheme.typography.bodyMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+        Spacer(Modifier.height(Dimens.lg))
+        Button(onClick = onRetry) {
+            Text("Réessayer")
+        }
+    }
+}

composeApp/src/commonMain/kotlin/ch/parano/myicek/ui/components/SkeletonCard.kt

@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// MyIce Kotlin Multiplatform — schedule/convocation viewer
+// Copyright (C) 2026  parano.ch
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package ch.parano.myicek.ui.components
+
+import androidx.compose.animation.core.RepeatMode
+import androidx.compose.animation.core.animateFloat
+import androidx.compose.animation.core.infiniteRepeatable
+import androidx.compose.animation.core.rememberInfiniteTransition
+import androidx.compose.animation.core.tween
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import ch.parano.myicek.ui.theme.Dimens
+
+@Composable
+fun SkeletonCard(modifier: Modifier = Modifier) {
+    val transition = rememberInfiniteTransition(label = "shimmer")
+    val alpha by transition.animateFloat(
+        initialValue = 0.3f,
+        targetValue = 0.6f,
+        animationSpec = infiniteRepeatable(
+            animation = tween(800),
+            repeatMode = RepeatMode.Reverse,
+        ),
+        label = "shimmerAlpha",
+    )
+
+    val skeletonColor = MaterialTheme.colorScheme.surfaceVariant
+    val skeletonModifier = Modifier
+        .alpha(alpha)
+        .background(skeletonColor, RoundedCornerShape(4.dp))
+
+    Box(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = Dimens.lg, vertical = Dimens.sm)
+            .clip(MaterialTheme.shapes.medium)
+            .background(MaterialTheme.colorScheme.surface)
+            .padding(Dimens.lg),
+    ) {
+        Column(verticalArrangement = Arrangement.spacedBy(Dimens.sm)) {
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween,
+            ) {
+                Box(modifier = Modifier
+                    .height(20.dp)
+                    .width(160.dp)
+                    .then(skeletonModifier))
+                Box(modifier = Modifier
+                    .size(28.dp)
+                    .clip(CircleShape)
+                    .then(skeletonModifier))
+            }
+            Box(modifier = Modifier
+                .height(16.dp)
+                .width(200.dp)
+                .then(skeletonModifier))
+            Box(modifier = Modifier
+                .height(16.dp)
+                .width(180.dp)
+                .then(skeletonModifier))
+        }
+    }
+}