Improve cookie login flow with enhanced instructions and script generation

Update the cookie login page to provide clearer instructions, generate a more robust login script with additional security parameters, and redirect to the mobile Facebook site.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: f2ad72a2-6e00-40aa-abba-7ea71849d7c5
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: d83bdc8e-658e-4b5d-83ad-7c8f1071a6ca
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