⚡ Optimize ExternalContentBridge contact lookup queries

[xRahul]

💡 What:
Replaced the loop-based PhoneLookup query mechanism in ExternalContentBridge.getContactNames with a batched query against ContactsContract.CommonDataKinds.Phone.

🎯 Why:
The previous implementation performed one IPC/database query per phone number (N+1 problem). For a list of 50 SMS messages, this meant 50 separate IPC calls, causing significant UI lag or processing delay.

📊 Measured Improvement:

• Baseline: N queries for N phone numbers.
• Optimized: ceil(N/50) queries. For typical use cases (e.g., inbox list), this reduces queries from ~20-50 to 1.
• Verification: Added ExternalContentBridgeTest.java using Robolectric and a mock ContentProvider to confirm that looking up 3 contacts results in exactly 1 query instead of 3.

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PR created automatically by Jules for task 17496235591141227007 started by @xRahul

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