Function decodePointer

decodePointer(input: string): AppletPointer
Decode what a user typed or clicked into the event to fetch.

Accepts naddr1…, nevent1…, note1…, a bare 64-hex event id, any of those behind a nostr: prefix, and plain coordinates in either <pubkey>:<kind>:<identifier> or NIP-01 <kind>:<pubkey>:<identifier> order. An encoded address is also found inside a link or a sentence, since that is how addresses are shared. The result says which event to fetch and nothing more; trust comes from verifying that event, never from the pointer.
Parameters
- input: string
  The address text.
Returns AppletPointer
The decoded pointer.
Throws
invalid:pointer for anything else.
Example
```
decodePointer('nostr:naddr1…').kind; // 'address'
decodePointer(`${pubkey}:35129:chat`); // { kind: 'address', pubkey, identifier: 'chat', eventKind: 35129, relays: [] }
decodePointer('https://applets.example/n/naddr1…?ref=share').kind; // 'address'
```