Review of T0 (Electron scaffold) approved with one Important finding + cheap
Minors. All fixes scoped to app/.
- usePolled: replace per-call cancel closure with a generation/epoch counter so
an orphaned in-flight fetch (from refresh() or an interval tick, discarded
cancel handle) can't resolve after a newer fetch and clobber fresh data. New
TDD race test (slow deps-A resolves after fast deps-B; keeps B).
- cli: nvm resolution now scans version dirs descending and takes the first
whose bin actually contains codeburn (was lexicographic max, unverified),
matching CodeburnCLI.swift. Export nodeManagerDirs + hermetic nvm test.
- index.html: tighten CSP connect-src ws: -> ws://localhost:5173.
- preload: import type { Envelope } from main instead of redeclaring it.
- main.test: table-driven channel->argv assertion over all 9 codeburn:* channels
plus a keys check and a non-spawning cliStatus case.
Ports the wireframe window shell into React with exact markup/classes:
- Shared components: Window, Sidebar (traffic lights, gradient mark, six
nav items with ⌘ keycaps + active `on` rail, status line), TopBar
(title, scope, period SegTabs Today/7D/30D/Month/6M/Custom, ProviderPop),
Panel, Stat, SegTabs, ProviderPop, Hint.
- usePolled(fetcher, deps): generic 30s poll + loading/error state,
errors normalized to CliError.
- App.tsx: local section state switches the content outlet; the Overview
placeholder round-trips getOverview('30days','all') and renders the raw
current.cost, with an honest first-run "locate CLI" state when the
codeburn binary isn't found (never a crash).
- Sidebar.test.tsx: six nav items, click routes onNavigate, active `on`.
