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/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()
+                        },
+                    ),
                 )
             }
         },