Restyle community tab to terminal design

Bring the agent Community tab in line with the terminal design board:
blog section (>BLOG // SELF_NOTES + >View_all), square scanline blog
cards with uppercase titles and [date], >AGENT_REVIEWS // HOLDERS_ONLY
review wall, and a terminal CommentThreadList (square avatars, mono
wallets, [Reply], indented replies).

Rework the blog post full view: >BLOG_POST sequence strip, [<] Blog_Post
header, scanline hero, //AUTHOR_ meta row, and a >COMMENTS section whose
composer stays open to any connected wallet. Post comments are open;
the reputation review wall remains holder-gated.

Author: zo-sol