fix(log): a screen reader could not delete a contact at all

A Material 3 conformance audit measured three real defects on the logging screen.

Deleting was reachable only by dragging. SwipeDeleteRow declared no semantics, so TalkBack
saw a row of text with no actions - a switch or Voice Access user could not delete a record,
not with difficulty but at all. The arming threshold was 75% of row width, roughly 249dp of
continuous travel on a 360dp phone, against 120dp in this project's own SwipeableItem. Delete
and undo are now custom accessibility actions on the row, which is the case the Compose
accessibility guide names explicitly: swipe gestures should be exposed this way because they
are hard or impossible for users with motor impairments.

The undo affordance was a 29dp target with a five-second countdown running behind it - the
worst place in the screen to be hard to hit, because a miss is unrecoverable. Now 48dp by
64dp, matching the mode and time rows.

The trash glyph was the emoji U+1F5D1, which renders differently on every device and font
and which this project forbids as an icon. ic_delete.xml already existed and is used in three
other screens.

Not addressed, and worth recording from the same audit: the table grid line at 0xFF3A3A3A
computes to 1.65:1 against its background where Material asks 3:1, so the grid the Log page
is built around is nearly invisible and gone in sunlight; and under the app's night filter
the green upload tick collapses to 1.27:1 while being encoded in colour alone.

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

@@ -318,6 +318,7 @@
     <string name="prefs_wavelog_qrz_label">Cookie</string>
     <string name="wavelog_copy">复制</string>
     <string name="wavelog_delete_undo">撤销</string>
+    <string name="wavelog_delete_action">删除这条联络</string>
     <string name="wavelog_col_time">时间</string>
     <string name="wavelog_col_freq">频率</string>
     <string name="wavelog_col_sat">卫星</string>

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

@@ -349,6 +349,7 @@
     <string name="prefs_wavelog_qrz_label">Cookie</string>
     <string name="wavelog_copy">Copy</string>
     <string name="wavelog_delete_undo">Undo</string>
+    <string name="wavelog_delete_action">Delete this contact</string>
     <string name="wavelog_col_time">Time</string>
     <string name="wavelog_col_freq">Freq</string>
     <string name="wavelog_col_sat">Satellite</string>