Add card/list view toggle and owner filter dropdown to the agents page.
New AgentListRow component for compact list display. i18n keys added
for en, vi, zh locales.
* docs: add brainstorm report for discord guild-user memory
* docs: update brainstorm report with corrected root cause analysis
* feat(discord): per-user memory scope in guild channels
Fixes shared USER.md between guild members by scoping userID to
"guild:{guildID}:user:{senderID}" for Discord group messages.
Updates all group-context prefix checks (write permissions, writer
cache, cron peer kind, history filter) to include the new guild: prefix.
Closes#165