feat: re-add phishing detection configuration with separate fuzzy matching toggle

[brenopolanski]

Summary

Re-adds the phishing detection configuration feature from v0.8.6 with an enhanced implementation that separates fuzzy matching into its own toggle.

New Settings:

• settings:phishingDetector (default: true) - Master switch to enable/disable all phishing detection
• settings:phishingFuzzyMatch (default: false) - Toggle for approximate/spelling-based impersonation detection

Preview

Tests

• Keep "Enable phishing detection" ON
• Toggle "Enable fuzzy matching" ON

Try accessing:

• https://ppancakeswap.finance/ -> Website impersonating https://pancakeswap.finance/
• http://daveswap.com/ -> Website impersonating https://pacaswap.com/

False positive:

• https://coin360.com/ -> Website impersonating https://coin98.com/

// Legitimate domains that might be in the fuzzy list:
"coinbase.com"   // Popular exchange
"coingecko.com"  // Market data
"coinmarketcap.com" // Market rankings
"coin98.com"     // Wallet/DeFi platform

// User visits:
"coin360.com"

// Levenshtein distances:
levenshtein.get("coinbase.com", "coin360.com")
// coinbase.com  = 12 chars
// coin360.com   = 11 chars
// Need to: delete 'b','a','s','e', insert '3','6','0'
// Distance = ~7 (too different, won't match)

levenshtein.get("coingecko.com", "coin360.com")
// coingecko.com = 13 chars
// coin360.com   = 11 chars
// Need to: replace 'gecko' with '360'
// Distance = ~5 (too different, won't match)

levenshtein.get("coin98.com", "coin360.com")
// coin98.com  = 10 chars
// coin360.com = 11 chars
// coin98  vs coin360
// Replace '98' with '360' (2 chars removed, 3 added)
// Distance = ~3 (might match!)

if (distance <= 3) → ⚠️ POSSIBLE FALSE POSITIVE