fix(turn): log addParticipants + updateParticipant (logging gaps)

addParticipants + updateParticipant returned log:null → invisible in
combat log. Contract test caught them. Now both return
log:{ message, undo:{ participants }}.

App.js handlers wired (handleAddAllCharacters, handleUpdateParticipant,
handleInlineInitiative) — call logAction on logged mutations.

Logging contract now complete: every mutating combat op produces a log
entry. No gaps. turn.logging.test.js proves it.

238 tests green.

src/App.js

@@ -940,8 +940,14 @@ function ParticipantManager({ encounter, encounterPath, campaignCharacters }) {
     }
 
     try {
-      const { patch } = addParticipants(encounter, newParticipants);
+      const { patch, log } = addParticipants(encounter, newParticipants);
       await storage.updateDoc(encounterPath, patch);
+      if (log) {
+        logAction(log.message, { encounterName: encounter.name }, {
+          encounterPath,
+          updates: log.undo,
+        });
+      }
     } catch (err) {
       alert("Failed to add all characters. Please try again.");
     }
@@ -950,8 +956,14 @@ function ParticipantManager({ encounter, encounterPath, campaignCharacters }) {
   const handleUpdateParticipant = async (updatedData) => {
     if (!db || !editingParticipant) return;
     try {
-      const { patch } = updateParticipant(encounter, editingParticipant.id, updatedData);
+      const { patch, log } = updateParticipant(encounter, editingParticipant.id, updatedData);
       await storage.updateDoc(encounterPath, patch);
+      if (log) {
+        logAction(log.message, { encounterName: encounter.name }, {
+          encounterPath,
+          updates: log.undo,
+        });
+      }
       setEditingParticipant(null);
     } catch (err) {
       alert("Failed to update participant. Please try again.");
@@ -967,8 +979,14 @@ function ParticipantManager({ encounter, encounterPath, campaignCharacters }) {
     const n = parseInt(value, 10);
     if (isNaN(n)) return;
     try {
-      const { patch } = updateParticipant(encounter, participantId, { initiative: n });
+      const { patch, log } = updateParticipant(encounter, participantId, { initiative: n });
       await storage.updateDoc(encounterPath, patch);
+      if (log) {
+        logAction(log.message, { encounterName: encounter.name }, {
+          encounterPath,
+          updates: log.undo,
+        });
+      }
     } catch (err) {
       // fall through silently
     }