fix(sessions): Messages stat card + slim prune button (#855)

* fix(sessions): show Messages stat + slim prune button

The Active stat card always rendered 0: the mobile model declared
'val active: Int = 0', a key GET /api/sessions/stats never sends
(backend returns total/active_store/archived/messages/by_source), and
with ignoreUnknownKeys = true deserialization silently fell back to 0.

Rework the stats row instead of just key-mapping:
- Messages card replaces Active, reading the 'messages' key
  (db.message_count(), web_routers/sessions.py:523-550)
- Prune becomes a slim 52dp icon-only card (contentDescription keeps it
  accessible) so the Messages card keeps width for large counts

* feat(sessions): compact stat counts (100k / 1.23m) for Total & Messages

formatCompactCount renders counts as max 3 digits + unit letter:
987 -> '987', 100987 -> '100k', 1234567 -> '1.23m', 100000000 -> '100m'.
Applied to both the Total and Messages stat cards so large numbers fit
the row. Covered by SessionsStatsFormatTest (5 test cases).

* fix(sessions): label prune + empty-cleanup buttons, drop top select toggle

- Prune card now sizes to its label (icon + 'Prune' text) instead of a
  52dp icon-only square, staying compact via wrap-content width.
- Empty-session cleanup becomes a labeled FilledTonalButton (icon +
  'Delete empty sessions', count badge kept) instead of a bare icon.
- Removed the top-bar select toggle (SelectAll icon); selection mode
  remains reachable via long-press > Select on any session row.
- Dropped now-orphaned content_desc_enter/exit_selection strings (en/ko).

* fix(sessions): prune card wrap-content width + shorter cleanup label

The prune card dropped its fixed 52dp width but kept fillMaxSize on the
inner Box — as an unweighted Row child that expands to the full row
width, starving the weighted Total/Messages cards (reported broken on
device). The Box now fills height only, so the Card wraps to its
content (icon + 'Prune').

Empty-session cleanup button label shortened to 'Delete empty'.

* fix(sessions): stack prune label under icon, cleanup button reads 'Empty'

- Prune card: trash icon above the 'Prune' label (column layout),
  still wrap-content width so Total/Messages keep their space.
- Empty-session cleanup button label shortened to 'Empty'.

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/data/model/SessionListResponse.kt

@@ -27,7 +27,9 @@ data class SessionInfo(
 @Serializable
 data class SessionStatsResponse(
     val total: Int = 0,
-    val active: Int = 0,
+    // Backend GET /api/sessions/stats returns "messages" (total stored
+    // messages) — the value the Sessions stats row shows.
+    val messages: Int = 0,
 )
 
 @Serializable

app/src/main/java/com/m57/hermescontrol/ui/sessions/SessionsScreen.kt

@@ -37,6 +37,7 @@ import androidx.compose.material.icons.filled.Code
 import androidx.compose.material.icons.filled.Delete
 import androidx.compose.material.icons.filled.DeleteSweep
 import androidx.compose.material.icons.filled.Edit
+import androidx.compose.material.icons.filled.Email
 import androidx.compose.material.icons.filled.History
 import androidx.compose.material.icons.filled.Language
 import androidx.compose.material.icons.filled.Search
@@ -53,8 +54,8 @@ import androidx.compose.material3.Checkbox
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.DropdownMenu
 import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.FilledTonalButton
 import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.OutlinedTextField
@@ -531,34 +532,26 @@ fun SessionsScreen(
                     modifier = Modifier.weight(1f),
                 )
                 Spacer(modifier = Modifier.width(spacing.sm))
-                IconButton(onClick = { viewModel.toggleSelecting() }) {
-                    Icon(
-                        imageVector = if (state.isSelecting) Icons.Filled.Close else Icons.Filled.SelectAll,
-                        contentDescription =
-                            if (state.isSelecting) {
-                                stringResource(R.string.content_desc_exit_selection)
-                            } else {
-                                stringResource(R.string.content_desc_enter_selection)
-                            },
-                    )
-                }
-                Spacer(modifier = Modifier.width(spacing.sm))
                 // Empty-session cleanup (issue #787) — grey/disabled when 0.
-                IconButton(
+                BadgedBox(
-                    onClick = { viewModel.requestEmptyCleanup() },
+                    badge = {
-                    enabled = state.emptyCount > 0,
+                        if (state.emptyCount > 0) {
+                            Badge { Text("${state.emptyCount}") }
+                        }
+                    },
                 ) {
-                    BadgedBox(
+                    FilledTonalButton(
-                        badge = {
+                        onClick = { viewModel.requestEmptyCleanup() },
-                            if (state.emptyCount > 0) {
+                        enabled = state.emptyCount > 0,
-                                Badge { Text("${state.emptyCount}") }
+                        contentPadding = PaddingValues(horizontal = spacing.md, vertical = 8.dp),
-                            }
-                        },
                     ) {
                         Icon(
                             imageVector = Icons.Filled.DeleteSweep,
-                            contentDescription = stringResource(R.string.sessions_empty_cleanup_desc),
+                            contentDescription = null,
+                            modifier = Modifier.size(18.dp),
                         )
+                        Spacer(modifier = Modifier.width(spacing.xs))
+                        Text(stringResource(R.string.sessions_empty_cleanup_desc))
                     }
                 }
             }
@@ -695,20 +688,20 @@ fun SessionsScreen(
                             ) {
                                 StatCard(
                                     label = stringResource(R.string.sessions_stat_total),
-                                    value = if (state.isLoadingStats) "…" else state.stats.total.toString(),
+                                    value = if (state.isLoadingStats) "…" else formatCompactCount(state.stats.total),
                                     icon = Icons.Filled.History,
                                     modifier = Modifier.weight(1f).fillMaxHeight(),
                                 )
                                 StatCard(
-                                    label = stringResource(R.string.sessions_stat_active),
+                                    label = stringResource(R.string.sessions_stat_messages),
-                                    value = if (state.isLoadingStats) "…" else state.stats.active.toString(),
+                                    value = if (state.isLoadingStats) "…" else formatCompactCount(state.stats.messages),
-                                    icon = Icons.Filled.CheckCircle,
+                                    icon = Icons.Filled.Email,
-                                    accentColor = statusColors.success,
                                     modifier = Modifier.weight(1f).fillMaxHeight(),
                                 )
-                                // Prune button card
+                                // Prune button — compact card sized to its label, so the
+                                // stat cards keep enough width for large counts.
                                 Card(
-                                    modifier = Modifier.weight(1f).fillMaxHeight(),
+                                    modifier = Modifier.fillMaxHeight(),
                                     colors =
                                         CardDefaults.cardColors(
                                             containerColor = MaterialTheme.colorScheme.surfaceContainer,
@@ -716,17 +709,22 @@ fun SessionsScreen(
                                     onClick = { viewModel.showPruneDialog() },
                                 ) {
                                     Box(
-                                        modifier = Modifier.fillMaxSize().padding(spacing.md),
+                                        // NOTE: fillMaxHeight only — never fillMaxSize here.
+                                        // An unweighted Row child with fillMaxSize expands to the
+                                        // full row width and starves the weighted stat cards.
+                                        modifier = Modifier.fillMaxHeight().padding(horizontal = spacing.md),
                                         contentAlignment = Alignment.Center,
                                     ) {
-                                        Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                                        Column(
+                                            horizontalAlignment = Alignment.CenterHorizontally,
+                                            verticalArrangement = Arrangement.spacedBy(spacing.xs),
+                                        ) {
                                             Icon(
                                                 imageVector = Icons.Filled.DeleteSweep,
                                                 contentDescription = null,
                                                 tint = statusColors.warning,
                                                 modifier = Modifier.size(20.dp),
                                             )
-                                            Spacer(modifier = Modifier.height(spacing.xs))
                                             Text(
                                                 text = stringResource(R.string.sessions_action_prune),
                                                 style = MaterialTheme.typography.labelMedium,

app/src/main/java/com/m57/hermescontrol/ui/sessions/SessionsViewModel.kt

@@ -21,12 +21,37 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
+import java.util.Locale
 
 data class SessionStats(
     val total: Int = 0,
-    val active: Int = 0,
+    val messages: Int = 0,
 )
 
+/**
+ * Compact count for stat cards: max 3 digits + unit letter.
+ * 987 → "987", 100987 → "100k", 1234567 → "1.23m", 100000000 → "100m".
+ */
+internal fun formatCompactCount(value: Int): String {
+    if (value < 1_000) return value.toString()
+    val (divisor, suffix) =
+        when {
+            value < 1_000_000 -> 1_000 to "k"
+            value < 1_000_000_000 -> 1_000_000 to "m"
+            else -> 1_000_000_000 to "b"
+        }
+    val scaled = value.toDouble() / divisor
+    val digits =
+        when {
+            scaled >= 100 -> scaled.toInt().toString()
+            scaled >= 10 -> String.format(Locale.US, "%.1f", scaled).trimZeroes()
+            else -> String.format(Locale.US, "%.2f", scaled).trimZeroes()
+        }
+    return "$digits$suffix"
+}
+
+private fun String.trimZeroes(): String = dropLastWhile { it == '0' }.trimEnd('.')
+
 data class SessionsUiState(
     val isLoading: Boolean = false,
     val isLoadingMore: Boolean = false,
@@ -244,7 +269,7 @@ class SessionsViewModel :
                         it.copy(
                             isLoadingStats = false,
                             stats =
-                                SessionStats(total = data.total, active = data.active),
+                                SessionStats(total = data.total, messages = data.messages),
                         )
                     }
                 },

app/src/main/res/values-ko/strings.xml

@@ -329,7 +329,7 @@
     <!-- Sessions Stats -->
     <string name="sessions_search_placeholder">세션 검색…</string>
     <string name="sessions_stat_total">전체</string>
-    <string name="sessions_stat_active">활성</string>
+    <string name="sessions_stat_messages">메시지</string>
     <string name="sessions_action_prune">정리</string>
     <string name="sessions_prune_title">오래된 세션 정리</string>
     <string name="sessions_prune_desc">지정된 일수보다 오래된 세션을 삭제합니다.</string>
@@ -342,8 +342,6 @@
     <string name="sessions_action_select_all">전체 선택</string>
     <string name="sessions_action_deselect_all">선택 해제</string>
     <string name="sessions_action_delete_n">%1$d개 삭제</string>
-    <string name="content_desc_enter_selection">세션 선택</string>
-    <string name="content_desc_exit_selection">선택 종료</string>
 
     <!-- Toolsets Screen -->
     <string name="toolsets_empty_title">툴셋이 없습니다</string>

app/src/main/res/values/strings.xml

@@ -506,13 +506,13 @@
     <string name="sessions_search_match_label">Match</string>
     <string name="sessions_search_model_label">Model</string>
     <string name="sessions_stat_total">Total</string>
-    <string name="sessions_stat_active">Active</string>
+    <string name="sessions_stat_messages">Messages</string>
     <string name="sessions_action_prune">Prune</string>
     <string name="sessions_prune_title">Prune Old Sessions</string>
     <string name="sessions_prune_desc">Delete sessions older than the specified number of days.</string>
     <string name="sessions_prune_days_label">Days threshold</string>
     <string name="sessions_prune_confirm">Prune</string>
-    <string name="sessions_empty_cleanup_desc">Delete empty sessions</string>
+    <string name="sessions_empty_cleanup_desc">Empty</string>
     <string name="sessions_empty_cleanup_title">Delete empty sessions?</string>
     <string name="sessions_empty_cleanup_message">Delete %1$d empty session(s). Active and archived sessions are kept.</string>
     <string name="sessions_empty_cleanup_confirm">Delete</string>
@@ -527,8 +527,6 @@
     <string name="sessions_action_rename">Rename</string>
     <string name="sessions_rename_title">Rename Session</string>
     <string name="sessions_rename_hint">Session title</string>
-    <string name="content_desc_enter_selection">Select sessions</string>
-    <string name="content_desc_exit_selection">Exit selection</string>
 
     <!-- Toolsets Screen -->
     <string name="toolsets_empty_title">No toolsets reported</string>

app/src/test/java/com/m57/hermescontrol/ui/sessions/SessionsStatsFormatTest.kt

@@ -0,0 +1,44 @@
+package com.m57.hermescontrol.ui.sessions
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class SessionsStatsFormatTest {
+    @Test
+    fun `under 1000 shows raw number`() {
+        assertEquals("0", formatCompactCount(0))
+        assertEquals("7", formatCompactCount(7))
+        assertEquals("987", formatCompactCount(987))
+        assertEquals("999", formatCompactCount(999))
+    }
+
+    @Test
+    fun `thousands compact to 3 digits plus k`() {
+        assertEquals("1k", formatCompactCount(1_000))
+        assertEquals("10k", formatCompactCount(10_000))
+        assertEquals("100k", formatCompactCount(100_987))
+        assertEquals("999k", formatCompactCount(999_999))
+    }
+
+    @Test
+    fun `fractional thousands keep one or two digits`() {
+        assertEquals("1.5k", formatCompactCount(1_500))
+        assertEquals("1.05k", formatCompactCount(1_050))
+        assertEquals("12.5k", formatCompactCount(12_500))
+    }
+
+    @Test
+    fun `millions compact to 3 digits plus m`() {
+        assertEquals("1m", formatCompactCount(1_000_000))
+        assertEquals("1.23m", formatCompactCount(1_234_567))
+        assertEquals("100m", formatCompactCount(100_000_000))
+        assertEquals("999m", formatCompactCount(999_999_999))
+    }
+
+    @Test
+    fun `billions compact to b`() {
+        assertEquals("1b", formatCompactCount(1_000_000_000))
+        assertEquals("2b", formatCompactCount(2_000_000_000))
+        assertEquals("2.15b", formatCompactCount(Int.MAX_VALUE))
+    }
+}