Improve Address Page Display and Contract Manager Optimization

[pmjanus]

Fixes #829 #860

Description

• Added blockie icons to address/contract/token pages for better visual identification
• Replaced generic icons with blockie-icons for contracts and normal addresses
• Retained token icons for ERC-20 tokens
• Increased field width for function names to show complete names
• Optimized contract manager by removing null address list cache
• Improved performance by using cached contract metadata from indexer API queries
• Eliminated redundant API calls to /v1/contract/{address}

Test scenarios

1. Address Icons:

   • Verify blockie icon display at: /address/0x77F0Db20D64051D081170e95fC0d0F5aa40C249c
   • Check contract icon at: /address/0x3B7023f3C99EAe2FA0AaeB9490A78d5D98a24148
   • Confirm token icon at: /address/0xB4B01216a5Bc8F1C8A33CD990A1239030E60C905?tab=transactions

2. Contract Manager:

   • Clear site data in Dev Tools (Applications Tab > Storage)
   • Navigate to address 0x0e79065B5F11b5BD1e62B935A600976ffF3754B9
   • Verify no additional calls to /v1/contract/{address}
   • Check Transactions Page for absence of redundant contract metadata queries

Checklist:

• I have performed a self-review of my own code
• I have commented code for complex icon generation logic
• My changes generate no new warnings
• I have tested for mobile functionality
• Performance improvements have been verified
• UI changes have been tested across different address types
• Cache optimization has been thoroughly tested

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