feat: Implement multi-tag filtering with dynamic SQL queries and improved UI

- Add RawQuery method getLinksByTags() to LinkDao for flexible tag filtering
- Implement dynamic SQL query generation for AND-based multi-tag filtering in LinkRepositoryImpl
- Parse and normalize tag input with whitespace handling and deduplication
- Replace single tag chip with FlowRow layout to display multiple selected tags
- Add individual tag removal capability while maintaining filter state
- Improve tag filter banner

app/src/main/java/com/shaarit/data/local/dao/LinkDao.kt

@@ -68,6 +68,9 @@ interface LinkDao {
     """)
     fun getLinksByMultipleTags(tag1: String, tag2: String): PagingSource<Int, LinkEntity>
 
+    @RawQuery(observedEntities = [LinkEntity::class])
+    fun getLinksByTags(query: SupportSQLiteQuery): PagingSource<Int, LinkEntity>
+    
     // ====== Filtres temporels ======
     
     @Query("""

app/src/main/java/com/shaarit/data/repository/LinkRepositoryImpl.kt

@@ -25,6 +25,7 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.firstOrNull
 import kotlinx.coroutines.flow.map
 import retrofit2.HttpException
+import androidx.sqlite.db.SimpleSQLiteQuery
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -56,12 +57,22 @@ constructor(
                 when {
                     !searchTerm.isNullOrBlank() -> linkDao.searchLinks(searchTerm)
                     !searchTags.isNullOrBlank() -> {
-                        val tags = searchTags.split(" ").filter { it.isNotBlank() }
-                        if (tags.size == 1) {
-                            linkDao.getLinksByTag(tags.first())
+                        val tags =
+                            searchTags
+                                .trim()
+                                .split(Regex("\\s+"))
+                                .map { it.trim() }
+                                .filter { it.isNotBlank() }
+                                .distinct()
+
+                        if (tags.isEmpty()) {
+                            linkDao.getAllLinksPaged()
                         } else {
-                            // Pour plusieurs tags, on prend les liens qui ont au moins un des tags
-                            linkDao.getLinksByTag(tags.first())
+                            val whereClause = tags.joinToString(" AND ") { "tags LIKE ?" }
+                            val sql =
+                                "SELECT * FROM links WHERE $whereClause ORDER BY is_pinned DESC, created_at DESC"
+                            val args: Array<Any> = tags.map { "%\"$it\"%" }.toTypedArray()
+                            linkDao.getLinksByTags(SimpleSQLiteQuery(sql, args))
                         }
                     }
                     else -> linkDao.getAllLinksPaged()

app/src/main/java/com/shaarit/presentation/feed/FeedScreen.kt

@@ -8,6 +8,8 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.foundation.lazy.grid.items
+import androidx.compose.foundation.lazy.items
 import androidx.compose.material.ExperimentalMaterialApi
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.*
@@ -15,6 +17,8 @@ import androidx.compose.material.pullrefresh.PullRefreshIndicator
 import androidx.compose.material.pullrefresh.pullRefresh
 import androidx.compose.material.pullrefresh.rememberPullRefreshState
 import androidx.compose.material3.*
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -31,7 +35,7 @@ import com.shaarit.ui.components.PremiumTextField
 import com.shaarit.ui.components.TagChip
 import com.shaarit.ui.theme.*
 
-@OptIn(ExperimentalMaterial3Api::class, ExperimentalMaterialApi::class)
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalMaterialApi::class, ExperimentalLayoutApi::class)
 @Composable
 fun FeedScreen(
     onNavigateToAdd: () -> Unit,
@@ -241,27 +245,52 @@ fun FeedScreen(
                                 modifier = Modifier
                                     .fillMaxWidth()
                                     .background(DarkNavy)
-                                    .padding(horizontal = 16.dp, vertical = 12.dp),
-                                verticalAlignment = Alignment.CenterVertically,
+                                    .padding(horizontal = 16.dp, vertical = 8.dp),
+                                verticalAlignment = Alignment.Top,
                                 horizontalArrangement = Arrangement.spacedBy(8.dp)
                             ) {
                                 Text(
                                     "Filtering by:",
                                     style = MaterialTheme.typography.bodyMedium,
-                                    color = TextSecondary
+                                    color = TextSecondary,
+                                    modifier = Modifier.padding(top = 6.dp)
                                 )
-                                TagChip(
-                                    tag = searchTags!!,
-                                    isSelected = true,
-                                    onClick = { viewModel.clearTagFilter() }
-                                )
-                                Spacer(modifier = Modifier.weight(1f))
-                                IconButton(onClick = { viewModel.clearTagFilter() }) {
+
+                                val selectedTags =
+                                    remember(searchTags) {
+                                        searchTags
+                                            .orEmpty()
+                                            .trim()
+                                            .split(Regex("\\s+"))
+                                            .map { it.trim() }
+                                            .filter { it.isNotBlank() }
+                                            .distinct()
+                                    }
+
+                                FlowRow(
+                                    modifier = Modifier.weight(1f),
+                                    horizontalArrangement = Arrangement.spacedBy(8.dp),
+                                    verticalArrangement = Arrangement.spacedBy(6.dp),
+                                    maxItemsInEachRow = 3
+                                ) {
+                                    selectedTags.forEach { tag ->
+                                        TagChip(
+                                            tag = tag,
+                                            isSelected = true,
+                                            onClick = { viewModel.onTagClicked(tag) }
+                                        )
+                                    }
+                                }
+
+                                IconButton(
+                                    onClick = { viewModel.clearTagFilter() },
+                                    modifier = Modifier.size(32.dp)
+                                ) {
                                     Icon(
                                         Icons.Default.Close,
                                         contentDescription = "Clear filter",
                                         tint = TextMuted,
-                                        modifier = Modifier.size(20.dp)
+                                        modifier = Modifier.size(18.dp)
                                     )
                                 }
                             }