fix(log): TalkBack could not find the mode row

The tappable mode row used a bare `clickable`, which declares no role. TalkBack read it as
two pieces of text with nothing to say it could be activated, so the only way to correct a
wrong mode was invisible to anyone using a screen reader - and the row had just become the
only way to reach that field.

Role.Button plus an onClickLabel naming the action. The label lives in the resource files
like every other user-visible string.

Caught by self-review against the project's own accessibility pattern in Components.kt
rather than by a test; Compose UI is not unit-tested here, so this class of defect is only
ever found by reading.

core/presentation/src/main/res/values-zh/strings.xml

@@ -277,6 +277,7 @@
     <string name="wavelog_select_transponder">选择转发器</string>
     <string name="wavelog_call_hint">对方呼号</string>
     <string name="wavelog_mode_hint">模式</string>
+    <string name="wavelog_mode_edit">修改模式</string>
     <string name="wavelog_saved">已存入本地日志</string>
     <string name="wavelog_upload_done">已上传 %1$d 条, %2$d 条仍在队列</string>
     <string name="wavelog_upload_all_ok">已上传 %1$d 条</string>

core/presentation/src/main/res/values/strings.xml

@@ -308,6 +308,7 @@
     <string name="wavelog_select_transponder">Select transponder</string>
     <string name="wavelog_call_hint">Callsign</string>
     <string name="wavelog_mode_hint">Mode</string>
+    <string name="wavelog_mode_edit">Edit the mode</string>
     <string name="wavelog_saved">Saved to local log</string>
     <string name="wavelog_upload_done">Uploaded %1$d, %2$d still queued</string>
     <string name="wavelog_upload_all_ok">Uploaded %1$d QSO</string>