Polish sidebar creation and terminal headers

Overview v2 (groups, markdown expand, working indicator, codex cwd fallback), page landing fix, labelled create fields, boot cover, touch scroll, flat dots

Creation UX: agents-first widget with prepopulated name, folder picker with matching glyph, Shell/Files quick-add buttons

Decouple names from folders (explicit paths + folder picker, visual-only groups), pin Codex conversations, fix drag-into-group, async usage, WS origin check, secrets filter

New agent: select an agent then Create (no immediate-create on logo click)

New-agent logo-button picker; new-group per-agent quantity cart

Public template: auto-locks at runtime, shows duplicate-to-private widget