Ports app.js's renderNeedsLoginIdle/renderLoginInProgress as real
functional Preact UI, not just a StatusChip label: a start-login
button (POST login/start), the OAuth-URL link once claude emits it,
a code-paste form (POST login/code, masked + reveal toggle) with
cancel (POST login/cancel), and the streamed process output. Without
this, an agent needing re-login (post-/logout, credential rotation)
had no web-UI path back in through the new page — the gap I flagged
before the cutover; mara: "1 - do it now".
Reuses agent.css's existing .agent-status-overlay/.status-needs-login/
.btn-login/.loginform*/.diff rules verbatim (same class names as the
old markup), matching Header.tsx's precedent — no new CSS file needed.
Added SessionView to types.ts (mirrors hive-agent's SessionView struct
exactly: url/output/finished/exit_note) and lib/loginAction.ts (same
{ok,detail} fetch shape as modelEffort.ts — same-origin POSTs, no CORS
concerns like pauseAction.ts's dashboard-origin actions).
Screenshot-verified all 3 states (idle, in-progress-with-url, finished
with error) against a mock server.
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