feat: add smart pattern detection for emails, names, usernames, phones

Instead of requiring explicit mappings for every variation, users
now configure their identity once (Identity tab) and Silent Send
auto-catches:
- Emails: any address @gmail, @yahoo, @outlook, etc.
- Names: first/last, full name, reversed, possessives, case variants
- Usernames: user@host, ~user, /home/user, C:\Users\user
- Phones: all common formats ((555) 123-4567, 555.123.4567, etc.)

Smart patterns run before explicit mappings, so explicit rules
can override smart catches when needed.

https://claude.ai/code/session_01Dvgwe7XMoSxnWXkih8p1Cw

src/lib/storage.js

@@ -9,6 +9,7 @@ import api from './browser-polyfill.js';
 
 const KEYS = {
   MAPPINGS: 'ss_mappings',
+  IDENTITY: 'ss_identity',
   LOG: 'ss_activity_log',
   SETTINGS: 'ss_settings',
 };
@@ -64,6 +65,25 @@ const Storage = {
     await this.saveMappings(filtered);
   },
 
+  // --- Identity (Smart Patterns) ---
+
+  async getIdentity() {
+    const result = await api.storage.local.get(KEYS.IDENTITY);
+    return result[KEYS.IDENTITY] || {
+      emails: [],
+      names: [],
+      usernames: [],
+      phones: [],
+      catchAllEmail: '',
+      emailDomains: [],
+      enabled: { emails: true, names: true, usernames: true, phones: true, paths: true },
+    };
+  },
+
+  async saveIdentity(identity) {
+    await api.storage.local.set({ [KEYS.IDENTITY]: identity });
+  },
+
   // --- Activity Log ---
 
   async getLog() {