feat: enable ticket comment editing

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

web/convex/tickets.ts

@@ -405,6 +405,45 @@ export const addComment = mutation({
   },
 });
 
+export const updateComment = mutation({
+  args: {
+    ticketId: v.id("tickets"),
+    commentId: v.id("ticketComments"),
+    actorId: v.id("users"),
+    body: v.string(),
+  },
+  handler: async (ctx, { ticketId, commentId, actorId, body }) => {
+    const comment = await ctx.db.get(commentId);
+    if (!comment || comment.ticketId !== ticketId) {
+      throw new ConvexError("Comentário não encontrado");
+    }
+    if (comment.authorId !== actorId) {
+      throw new ConvexError("Você não tem permissão para editar este comentário");
+    }
+
+    const now = Date.now();
+    await ctx.db.patch(commentId, {
+      body,
+      updatedAt: now,
+    });
+
+    const actor = (await ctx.db.get(actorId)) as Doc<"users"> | null;
+    await ctx.db.insert("ticketEvents", {
+      ticketId,
+      type: "COMMENT_EDITED",
+      payload: {
+        commentId,
+        actorId,
+        actorName: actor?.name,
+        actorAvatar: actor?.avatarUrl,
+      },
+      createdAt: now,
+    });
+
+    await ctx.db.patch(ticketId, { updatedAt: now });
+  },
+});
+
 export const removeCommentAttachment = mutation({
   args: {
     ticketId: v.id("tickets"),