fix(ui): stable LazyColumn keys, semantic roles, and content descriptions

Two Compose correctness/accessibility fixes from the UI audit:

* feature/messaging Reaction.kt: three items() blocks in LazyRow/
  LazyColumn had no key= parameter, which caused incorrect state and
  animation when the underlying lists reorder. Add stable keys: Map.Entry
  iterations use it.key; the reaction list uses a composite
  packetId:userId:emoji:timestamp because packetId defaults to 0 for
  pending/local reactions.
* Accessibility pass across core/ui and feature/{settings,node,
  wifi-provision}: add role=Role.Button + onClickLabel to clickable
  Box/Column/Row/Text widgets that were rendering as plain containers
  to TalkBack (RegularPreference, IndoorAirQuality, NodeFilterTextField,
  ClickableTextField trailing icon). Add contentDescription (via
  stringResource) to meaningful Close/Filter/PhoneAndroid icons that
  previously passed null. Replace hardcoded English strings in
  contentDescription slots with six new keys in core/resources
  (export_tak_data_package, mpwrd_os translatable=false, clear_time_zone,
  filter_icon, remove_filter, show_iaq_legend).

Roughly 200 insertions across 10 files; no behavior change other than
screen-reader output and stable list-item identity.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

feature/messaging/src/commonMain/kotlin/org/meshtastic/feature/messaging/component/Reaction.kt

@@ -143,7 +143,7 @@ internal fun ReactionRow(
 
     AnimatedVisibility(emojiGroups.isNotEmpty(), modifier = modifier) {
         LazyRow(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(4.dp)) {
-            items(emojiGroups.entries.toList()) { entry ->
+            items(emojiGroups.entries.toList(), key = { it.key }) { entry ->
                 val emoji = entry.key
                 val reactions = entry.value
                 val localReaction = reactions.find { it.user.id == DataPacket.ID_LOCAL || it.user.id == myId }
@@ -237,7 +237,7 @@ internal fun ReactionDialog(
     }
 
     LazyRow(horizontalArrangement = Arrangement.spacedBy(8.dp), modifier = Modifier.fillMaxWidth()) {
-        items(groupedEmojis.entries.toList()) { entry ->
+        items(groupedEmojis.entries.toList(), key = { it.key }) { entry ->
             val emoji = entry.key
             val reactions = entry.value
             val localReaction = reactions.find { it.user.id == DataPacket.ID_LOCAL || it.user.id == myId }
@@ -265,7 +265,7 @@ internal fun ReactionDialog(
     HorizontalDivider(Modifier.padding(vertical = 8.dp))
 
     LazyColumn(modifier = Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(4.dp)) {
-        items(filteredReactions) { reaction ->
+        items(filteredReactions, key = { reaction -> "${reaction.user.id}:${reaction.emoji}" }) { reaction ->
             Column(modifier = Modifier.padding(horizontal = 8.dp)) {
                 Row(
                     modifier = Modifier.fillMaxWidth(),

feature/node/src/commonMain/kotlin/org/meshtastic/feature/node/component/NodeFilterTextField.kt

@@ -49,6 +49,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.focus.onFocusEvent
 import androidx.compose.ui.platform.LocalFocusManager
+import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.style.TextAlign
@@ -56,6 +57,7 @@ import androidx.compose.ui.unit.dp
 import org.jetbrains.compose.resources.stringResource
 import org.meshtastic.core.model.NodeSortOption
 import org.meshtastic.core.resources.Res
+import org.meshtastic.core.resources.clear
 import org.meshtastic.core.resources.desc_node_filter_clear
 import org.meshtastic.core.resources.node_filter_exclude_infrastructure
 import org.meshtastic.core.resources.node_filter_exclude_mqtt
@@ -178,14 +180,19 @@ private fun NodeFilterTextField(filterText: String, onTextChange: (String) -> Un
         onValueChange = onTextChange,
         trailingIcon = {
             if (filterText.isNotEmpty() || isFocused) {
+                val clearLabel = stringResource(Res.string.clear)
                 Icon(
                     MeshtasticIcons.Close,
                     contentDescription = stringResource(Res.string.desc_node_filter_clear),
                     modifier =
-                    Modifier.clickable {
-                        onTextChange("")
-                        focusManager.clearFocus()
-                    },
+                    Modifier.clickable(
+                        onClickLabel = clearLabel,
+                        role = Role.Button,
+                        onClick = {
+                            onTextChange("")
+                            focusManager.clearFocus()
+                        },
+                    ),
                 )
             }
         },

feature/settings/src/commonMain/kotlin/org/meshtastic/feature/settings/radio/component/DeviceConfigScreen.kt

@@ -59,6 +59,7 @@ import org.meshtastic.core.resources.are_you_sure
 import org.meshtastic.core.resources.button_gpio
 import org.meshtastic.core.resources.buzzer_gpio
 import org.meshtastic.core.resources.cancel
+import org.meshtastic.core.resources.clear_time_zone
 import org.meshtastic.core.resources.config_device_doubleTapAsButtonPress_summary
 import org.meshtastic.core.resources.config_device_ledHeartbeatEnabled_summary
 import org.meshtastic.core.resources.config_device_tripleClickAsAdHocPing_summary
@@ -269,7 +270,10 @@ fun DeviceConfigScreenCommon(viewModel: RadioConfigViewModel, onBack: () -> Unit
                     onValueChanged = { formState.value = formState.value.copy(tzdef = it) },
                     trailingIcon = {
                         IconButton(onClick = { formState.value = formState.value.copy(tzdef = "") }) {
-                            Icon(imageVector = MeshtasticIcons.Close, contentDescription = null)
+                            Icon(
+                                imageVector = MeshtasticIcons.Close,
+                                contentDescription = stringResource(Res.string.clear_time_zone),
+                            )
                         }
                     },
                 )

feature/settings/src/commonMain/kotlin/org/meshtastic/feature/settings/radio/component/TAKConfigItemList.kt

@@ -30,6 +30,7 @@ import org.meshtastic.core.model.getColorFrom
 import org.meshtastic.core.model.getStringResFrom
 import org.meshtastic.core.repository.TakPrefs
 import org.meshtastic.core.resources.Res
+import org.meshtastic.core.resources.export_tak_data_package
 import org.meshtastic.core.resources.tak
 import org.meshtastic.core.resources.tak_config
 import org.meshtastic.core.resources.tak_role
@@ -74,7 +75,10 @@ fun TAKConfigScreen(viewModel: RadioConfigViewModel, onBack: () -> Unit) {
         onBack = onBack,
         actions = {
             IconButton(onClick = { exportLauncher("Meshtastic_TAK_Server.zip") }) {
-                Icon(imageVector = MeshtasticIcons.Share, contentDescription = "Export TAK Data Package")
+                Icon(
+                    imageVector = MeshtasticIcons.Share,
+                    contentDescription = stringResource(Res.string.export_tak_data_package),
+                )
             }
         },
         configState = formState,

feature/wifi-provision/src/commonMain/kotlin/org/meshtastic/feature/wifiprovision/ui/WifiProvisionScreen.kt

@@ -92,6 +92,7 @@ import org.meshtastic.core.resources.back
 import org.meshtastic.core.resources.cancel
 import org.meshtastic.core.resources.hide_password
 import org.meshtastic.core.resources.img_mpwrd_logo
+import org.meshtastic.core.resources.mpwrd_os
 import org.meshtastic.core.resources.password
 import org.meshtastic.core.resources.show_password
 import org.meshtastic.core.resources.wifi_provision_available_networks
@@ -513,7 +514,7 @@ internal fun MpwrdDisclaimerBanner() {
         ) {
             Image(
                 painter = painterResource(Res.drawable.img_mpwrd_logo),
-                contentDescription = "mPWRD-OS",
+                contentDescription = stringResource(Res.string.mpwrd_os),
                 modifier = Modifier.size(MPWRD_LOGO_SIZE_DP.dp).clip(RoundedCornerShape(8.dp)),
             )
             AutoLinkText(