Account Lifecycle Management: remove account, sign out everywhere, and session expiry/re-auth

[saknarajapakshe]

Goal

Handle what happens after an account is linked: removing it, signing out everywhere, and (lower priority) recovering from an expired session.

Sub-issues

• Implement removeAccount() and logoutAll() in AccountContext #36 — Real removeAccount()/logoutAll() logic
• Account Settings Panel (Profile / Appearance tabs) #37 — "Manage your Account" dialog (edit name, remove account)
• Session expiry indicator in switcher (optional / lower priority) #38 — Optional: show when a linked account needs signing in again

Build order: #36 has no dependencies — start it today, in parallel with #23. #37 needs #33's confirm dialog. #38 is a nice-to-have, do it whenever.

Depends on

#28 (AccountContext).