Adds a "Profile" card backed by /api/v1/profile (PATCH) for the four
public-profile fields arcadia already had columns for. Bio moved out of
local prefs (the server one supersedes); local prefs keeps only title,
signature, defaultAgentId, and the avatar URL mirror.
Save/revert mirror the existing Account card's pattern. The new fields
get arcadia validation + audit logging for free.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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