fix: auto-generate unique IDs so multiple toasts display simultaneously

[lubauss]

Summary

Change the default toast ID from the hardcoded "sileo-default" to an auto-generated unique ID, so multiple toasts can display simultaneously.

Problem

In createToast(), when no id is provided, it defaults to "sileo-default":

const id = merged.id ?? "sileo-default";

This means every toast without an explicit id shares the same identifier. Calling sileo.success(...) twice in quick succession replaces the first toast instead of showing two separate notifications.

// Only shows ONE toast — the second replaces the first
sileo.success({ title: "Toast 1" });
sileo.success({ title: "Toast 2" });

This is unexpected — most toast libraries (Sonner, react-hot-toast, etc.) show each call as a separate notification.

Solution

Use the existing generateId() helper (already defined in the file) as the default:

// Before
const id = merged.id ?? "sileo-default";

// After
const id = merged.id ?? generateId();

generateId() produces IDs like "3-m1abc2d-x7k9f2" (counter + timestamp + random), ensuring uniqueness.

Files Changed

File	Changes
src/toast.tsx (line 134)	Replace "sileo-default" with generateId()

Backward Compatibility

• Explicit id usage still works exactly as before (deduplicated)
• Only affects the default case where no id is provided
• Users who want the old "replace" behavior can pass a fixed id:

// Still deduplicates when you pass an explicit id
sileo.success({ title: "Toast 1", id: "my-toast" });
sileo.success({ title: "Toast 2", id: "my-toast" }); // Replaces first

Testing

// After fix: shows TWO separate toasts
sileo.success({ title: "Toast 1" });
sileo.success({ title: "Toast 2" });