Improve handling tags + improve combine bullets in ntfy backend

grammar/task.pegjs

@@ -42,7 +42,7 @@ labelWhitespace = whitespace:[ \t\r]+ {
   }
 }
 
-tag = "#" tag:[a-zA-Z0-9-]+ {
+tag = "#" tag:[a-zA-Z0-9-/]+ {
   return {
     span: "tag",
     value: tag.join("")

src/backend/ntfy.ts

@@ -164,10 +164,10 @@ function defaultMapper(task: Task): NtfyDTO {
   }
 }
 
-function defaultCombineMapper(tasks: Task[], bullet = "-"): NtfyDTO {
+function defaultCombineMapper(tasks: Task[], bullet = (index: number) => "-"): NtfyDTO {
   const text = tasks
     .toSorted((a, b) => b.priority - a.priority)
-    .map(t => `${bullet} ${t.label}`)
+    .map((t, i) => `${bullet(i)} ${t.label}`)
     .join("\n");
     
   const priority = mapPriority(Math.max(...tasks.map(t => t.priority)));