fix(desktop): make keyboard shortcuts work on Windows and Linux

app/renderer/App.test.tsx

@@ -1,6 +1,6 @@
 // @vitest-environment jsdom
 import { act, fireEvent, render, screen, waitFor } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 
 import { App, overviewMemoKey, topCategoryByModel, usageSnapshotProps } from './App'
 import { sanitizeProps } from '../electron/telemetry'
@@ -52,6 +52,16 @@ function setVisibility(state: 'visible' | 'hidden') {
   Object.defineProperty(document, 'hidden', { configurable: true, get: () => state === 'hidden' })
 }
 
+// The shortcut code (lib/platform.ts) reads `window.codeburn.platform` at call
+// time; stub it per test and always restore so no test leaks platform state.
+function setPlatform(platform: string): void {
+  ;(window as unknown as { codeburn?: { platform?: string } }).codeburn = { platform }
+}
+
+function clearPlatform(): void {
+  delete (window as unknown as { codeburn?: { platform?: string } }).codeburn
+}
+
 function overviewPayload(): MenubarPayload {
   const now = new Date()
   return {
@@ -181,6 +191,11 @@ describe('App shortcuts', () => {
     // the app-wide default ('today'); tests that exercise the default set it.
     localStorage.setItem('codeburn.defaultPeriod', '30days')
     document.documentElement.removeAttribute('data-theme')
+    setPlatform('darwin')
+  })
+
+  afterEach(() => {
+    clearPlatform()
   })
 
   it('applies the persisted theme on app boot before Settings mounts', async () => {
@@ -211,46 +226,59 @@ describe('App shortcuts', () => {
     expect(await screen.findByText('No sessions in this range yet.')).toBeInTheDocument()
   })
 
-  it('keeps command navigation, settings, and refresh shortcuts active without stale hints', async () => {
+  it.each([
+    ['darwin', { metaKey: true }, '⌘'],
+    ['win32', { ctrlKey: true }, 'Ctrl+'],
+  ] as const)('keeps %s navigation, settings, and refresh shortcuts active without stale hints', async (platform, chord, mod) => {
+    setPlatform(platform)
     render(<App />)
 
     expect(await screen.findByText('Most expensive sessions')).toBeInTheDocument()
-    expect(screen.getByText('⌘1-8')).toBeInTheDocument()
-    expect(screen.getAllByText('⌘,').length).toBeGreaterThan(0)
-    expect(screen.getByText('⌘R')).toBeInTheDocument()
+    expect(screen.getByText(`${mod}1-8`)).toBeInTheDocument()
+    expect(screen.getAllByText(`${mod},`).length).toBeGreaterThan(0)
+    expect(screen.getByText(`${mod}R`)).toBeInTheDocument()
     expect(screen.queryByText('Command')).not.toBeInTheDocument()
     expect(screen.queryByText('Export view')).not.toBeInTheDocument()
 
-    fireEvent.keyDown(document, { key: '2', metaKey: true })
+    fireEvent.keyDown(document, { key: '2', ...chord })
     expect(await screen.findByText('No sessions in this range yet.')).toBeInTheDocument()
 
-    fireEvent.keyDown(document, { key: '3', metaKey: true })
+    fireEvent.keyDown(document, { key: '3', ...chord })
     expect(await screen.findByText(/PR links are captured as sessions are parsed/)).toBeInTheDocument()
 
-    fireEvent.keyDown(document, { key: '4', metaKey: true })
+    fireEvent.keyDown(document, { key: '4', ...chord })
     expect(await screen.findByText('Cost flow · model → project')).toBeInTheDocument()
 
-    fireEvent.keyDown(document, { key: '5', metaKey: true })
+    fireEvent.keyDown(document, { key: '5', ...chord })
     expect(await screen.findByText('No waste findings in this range yet.')).toBeInTheDocument()
 
-    fireEvent.keyDown(document, { key: '6', metaKey: true })
+    fireEvent.keyDown(document, { key: '6', ...chord })
     expect(await screen.findByText('No model usage in this range yet.')).toBeInTheDocument()
 
-    fireEvent.keyDown(document, { key: '7', metaKey: true })
+    fireEvent.keyDown(document, { key: '7', ...chord })
     expect(await screen.findByText('Need at least two models with usage in this range to compare.')).toBeInTheDocument()
 
-    fireEvent.keyDown(document, { key: '8', metaKey: true })
+    fireEvent.keyDown(document, { key: '8', ...chord })
     expect(await screen.findByText('Not connected. Log in with the Claude CLI.')).toBeInTheDocument()
 
-    fireEvent.keyDown(document, { key: ',', metaKey: true })
+    fireEvent.keyDown(document, { key: ',', ...chord })
     expect((await screen.findAllByText('Settings')).length).toBeGreaterThan(0)
     expect(screen.queryByText('Back')).not.toBeInTheDocument()
 
     const overviewCalls = mocks.getOverview.mock.calls.length
-    fireEvent.keyDown(document, { key: 'r', metaKey: true })
+    fireEvent.keyDown(document, { key: 'r', ...chord })
     await waitFor(() => expect(mocks.getOverview.mock.calls.length).toBeGreaterThan(overviewCalls))
   })
 
+  it('ignores Ctrl+2 on mac', async () => {
+    render(<App />)
+
+    expect(await screen.findByText('Most expensive sessions')).toBeInTheDocument()
+
+    fireEvent.keyDown(document, { key: '2', ctrlKey: true })
+    expect(screen.queryByText('No sessions in this range yet.')).not.toBeInTheDocument()
+  })
+
   it('re-polls visible section data when period or provider changes', async () => {
     render(<App />)
 
@@ -481,6 +509,48 @@ describe('App shortcuts', () => {
   })
 })
 
+describe('win32 shortcut chords', () => {
+  beforeEach(() => {
+    installDefaultMocks()
+    localStorage.clear()
+    localStorage.setItem('codeburn.defaultPeriod', '30days')
+    document.documentElement.removeAttribute('data-theme')
+    setPlatform('win32')
+  })
+
+  afterEach(() => {
+    clearPlatform()
+  })
+
+  it('navigates with Ctrl+2 and refreshes with Ctrl+R', async () => {
+    render(<App />)
+    expect(await screen.findByText('Most expensive sessions')).toBeInTheDocument()
+
+    fireEvent.keyDown(document, { key: '2', ctrlKey: true })
+    expect(await screen.findByText('No sessions in this range yet.')).toBeInTheDocument()
+
+    const overviewCalls = mocks.getOverview.mock.calls.length
+    fireEvent.keyDown(document, { key: 'r', ctrlKey: true })
+    await waitFor(() => expect(mocks.getOverview.mock.calls.length).toBeGreaterThan(overviewCalls))
+  })
+
+  it('ignores Meta+2 on win32', async () => {
+    render(<App />)
+    expect(await screen.findByText('Most expensive sessions')).toBeInTheDocument()
+
+    fireEvent.keyDown(document, { key: '2', metaKey: true })
+    expect(screen.queryByText('No sessions in this range yet.')).not.toBeInTheDocument()
+  })
+
+  it('ignores Ctrl+Alt+2 (the AltGr shape) on win32', async () => {
+    render(<App />)
+    expect(await screen.findByText('Most expensive sessions')).toBeInTheDocument()
+
+    fireEvent.keyDown(document, { key: '2', ctrlKey: true, altKey: true })
+    expect(screen.queryByText('No sessions in this range yet.')).not.toBeInTheDocument()
+  })
+})
+
 describe('provider prefetch storm', () => {
   const PROVIDERS = [
     'claude', 'codex', 'gemini', 'grok', 'copilot', 'droid',
@@ -618,6 +688,11 @@ describe('currency correctness', () => {
     // independent of the app-wide default ('today').
     localStorage.setItem('codeburn.defaultPeriod', '30days')
     __resetPolledMemo()
+    setPlatform('darwin')
+  })
+
+  afterEach(() => {
+    clearPlatform()
   })
 
   it('never regresses the applied currency to a memo-served (stale) payload during a switch', async () => {

app/renderer/App.tsx

@@ -16,6 +16,7 @@ import { readDailyBudget } from './lib/budget'
 import { formatCompact, formatUsd, setActiveCurrency } from './lib/format'
 import { motionClass } from './lib/motion'
 import { codeburn } from './lib/ipc'
+import { isModifierChord, shortcutLabel } from './lib/platform'
 import { localDateKey } from './lib/period'
 import { persistRefreshValue, readRefreshValue, refreshValueToMs, RefreshCadenceContext, type RefreshCadence } from './lib/refreshCadence'
 import { OverviewContent } from './sections/Overview'
@@ -440,7 +441,7 @@ function AppMain() {
 
   useEffect(() => {
     const onKeyDown = (event: KeyboardEvent) => {
-      if (!event.metaKey || event.altKey || event.ctrlKey || event.shiftKey) return
+      if (!isModifierChord(event)) return
       const key = event.key.toLowerCase()
       if (key === '1') navigate('overview')
       else if (key === '2') navigate('sessions')
@@ -577,9 +578,9 @@ function AppMain() {
         {section !== 'settings' && (
           <Hint
             items={[
-              { k: '⌘1-8', label: 'Navigate' },
-              { k: '⌘,', label: 'Settings' },
-              { k: '⌘R', label: 'Refresh' },
+              { k: shortcutLabel('1-8'), label: 'Navigate' },
+              { k: shortcutLabel(','), label: 'Settings' },
+              { k: shortcutLabel('R'), label: 'Refresh' },
             ]}
             right={refreshedLabel(overview.lastSuccessAt, overview.loading, now)}
           />

app/renderer/components/Sidebar.test.tsx

@@ -1,18 +1,31 @@
 // @vitest-environment jsdom
-import { describe, it, expect, vi } from 'vitest'
+import { afterEach, describe, it, expect, vi } from 'vitest'
 import { render, screen, fireEvent } from '@testing-library/react'
 
 import { Sidebar } from './Sidebar'
 
+function setPlatform(platform: string): void {
+  ;(window as unknown as { codeburn?: { platform?: string } }).codeburn = { platform }
+}
+
 describe('Sidebar', () => {
-  it('renders all nine nav items in the desktop order', () => {
+  afterEach(() => {
+    delete (window as unknown as { codeburn?: { platform?: string } }).codeburn
+  })
+
+  it.each([
+    ['darwin', '⌘'],
+    ['win32', 'Ctrl+'],
+  ] as const)('renders all nine nav items in the desktop order with %s keycaps', (platform, mod) => {
+    setPlatform(platform)
     render(<Sidebar active="overview" onNavigate={() => {}} />)
-    const labels = screen.getAllByRole('button').map(item => item.textContent?.replace(/⌘[\d,]/, ''))
+    const esc = (s: string) => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+    const labels = screen.getAllByRole('button').map(item => item.textContent?.replace(/(⌘|Ctrl\+)[\d,]/, ''))
     expect(labels).toEqual(['Overview', 'Sessions', 'Pull requests', 'Spend', 'Optimize', 'Models', 'Compare', 'Plans', 'Settings'])
-    expect(screen.getByRole('button', { name: /Sessions.*⌘2/ })).toBeInTheDocument()
-    expect(screen.getByRole('button', { name: /Pull requests.*⌘3/ })).toBeInTheDocument()
-    expect(screen.getByRole('button', { name: /Compare.*⌘7/ })).toBeInTheDocument()
-    expect(screen.getByRole('button', { name: /Plans.*⌘8/ })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: new RegExp(`Sessions.*${esc(mod)}2`) })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: new RegExp(`Pull requests.*${esc(mod)}3`) })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: new RegExp(`Compare.*${esc(mod)}7`) })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: new RegExp(`Plans.*${esc(mod)}8`) })).toBeInTheDocument()
   })
 
   it('calls onNavigate with the section id when a nav item is clicked', () => {

app/renderer/components/Sidebar.tsx

@@ -1,37 +1,38 @@
 import { useState, type ReactNode } from 'react'
 
 import { codeburn } from '../lib/ipc'
+import { shortcutLabel } from '../lib/platform'
 import { AboutModal, type SocialLink } from './AboutModal'
 import { FlameMark } from './FlameMark'
 
 export type Section = 'overview' | 'sessions' | 'pullRequests' | 'spend' | 'optimize' | 'models' | 'compare' | 'plans' | 'settings'
 
 export const NAV_ITEMS: Array<{ id: Section; label: string; key: string; icon: ReactNode }> = [
-  { id: 'overview', label: 'Overview', key: '⌘1', icon: (
+  { id: 'overview', label: 'Overview', key: '1', icon: (
     <svg viewBox="0 0 24 24"><rect x="3" y="3" width="7" height="9" rx="1" /><rect x="14" y="3" width="7" height="5" rx="1" /><rect x="14" y="12" width="7" height="9" rx="1" /><rect x="3" y="16" width="7" height="5" rx="1" /></svg>
   ) },
-  { id: 'sessions', label: 'Sessions', key: '⌘2', icon: (
+  { id: 'sessions', label: 'Sessions', key: '2', icon: (
     <svg viewBox="0 0 24 24"><rect x="4" y="4" width="16" height="4" rx="1"/><rect x="4" y="10" width="16" height="4" rx="1"/><rect x="4" y="16" width="16" height="4" rx="1"/></svg>
   ) },
-  { id: 'pullRequests', label: 'Pull requests', key: '⌘3', icon: (
+  { id: 'pullRequests', label: 'Pull requests', key: '3', icon: (
     <svg viewBox="0 0 24 24"><circle cx="6" cy="6" r="3"/><circle cx="18" cy="18" r="3"/><path d="M13 6h3a2 2 0 0 1 2 2v7"/><line x1="6" y1="9" x2="6" y2="21"/></svg>
   ) },
-  { id: 'spend', label: 'Spend', key: '⌘4', icon: (
+  { id: 'spend', label: 'Spend', key: '4', icon: (
     <svg viewBox="0 0 24 24"><line x1="6" y1="20" x2="6" y2="13" /><line x1="12" y1="20" x2="12" y2="4" /><line x1="18" y1="20" x2="18" y2="9" /></svg>
   ) },
-  { id: 'optimize', label: 'Optimize', key: '⌘5', icon: (
+  { id: 'optimize', label: 'Optimize', key: '5', icon: (
     <svg viewBox="0 0 24 24"><circle cx="10.5" cy="10.5" r="3.4"/><path d="M10.5 3v1.7M10.5 16.3V18M3 10.5h1.7M16.3 10.5H18M5.3 5.3l1.2 1.2M14.5 14.5l1.2 1.2M15.7 5.3l-1.2 1.2M6.5 14.5l-1.2 1.2"/><line x1="15.5" y1="15.5" x2="20" y2="20"/></svg>
   ) },
-  { id: 'models', label: 'Models', key: '⌘6', icon: (
+  { id: 'models', label: 'Models', key: '6', icon: (
     <svg viewBox="0 0 24 24"><path d="M21 16V8a2 2 0 0 0-1-1.7l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.7l7 4a2 2 0 0 0 2 0l7-4A2 2 0 0 0 21 16z" /><path d="M3.3 7 12 12l8.7-5M12 22V12" /></svg>
   ) },
-  { id: 'compare', label: 'Compare', key: '⌘7', icon: (
+  { id: 'compare', label: 'Compare', key: '7', icon: (
     <svg viewBox="0 0 24 24"><path d="M8 3 4 7l4 4"/><path d="M4 7h16"/><path d="M16 21l4-4-4-4"/><path d="M20 17H4"/></svg>
   ) },
-  { id: 'plans', label: 'Plans', key: '⌘8', icon: (
+  { id: 'plans', label: 'Plans', key: '8', icon: (
     <svg viewBox="0 0 24 24"><rect x="2" y="5" width="20" height="14" rx="2" /><line x1="2" y1="10" x2="22" y2="10" /></svg>
   ) },
-  { id: 'settings', label: 'Settings', key: '⌘,', icon: (
+  { id: 'settings', label: 'Settings', key: ',', icon: (
     <svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="3" /><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 1 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 1 1-2.83-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 1 1 2.83-2.83l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 1 1 2.83 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z" /></svg>
   ) },
 ]
@@ -75,7 +76,7 @@ export function Sidebar({
           >
             {item.icon}
             {item.label}
-            <span className="k">{item.key}</span>
+            <span className="k">{shortcutLabel(item.key)}</span>
           </div>
         ))}
         <div className="push" />

app/renderer/lib/platform.ts

@@ -0,0 +1,46 @@
+// Single source of truth for platform-aware shortcut behaviour. The preload
+// exposes `window.codeburn.platform` (process.platform); when the bridge is
+// absent (unit tests, vite in a plain browser) fall back to the user agent.
+// All functions read platform state at call time, never at module load, so
+// the preload bridge may appear after this module is imported.
+
+function bridgePlatform(): string | undefined {
+  if (typeof window === 'undefined') return undefined
+  return (window as unknown as { codeburn?: { platform?: string } }).codeburn?.platform
+}
+
+function userAgentPlatform(): string | undefined {
+  if (typeof navigator === 'undefined') return undefined
+  if (/mac/i.test(navigator.userAgent)) return 'darwin'
+  const platform = navigator.platform
+  if (typeof platform === 'string' && /mac/i.test(platform)) return 'darwin'
+  return undefined
+}
+
+/** True when the Electron preload reports darwin (or the UA matches a Mac). */
+export function isMacPlatform(): boolean {
+  const platform = bridgePlatform()
+  if (platform) return platform === 'darwin'
+  return userAgentPlatform() === 'darwin'
+}
+
+/** The modifier keycap label: '⌘' on mac, 'Ctrl+' elsewhere. */
+export function modKeyLabel(): string {
+  return isMacPlatform() ? '⌘' : 'Ctrl+'
+}
+
+/** A full shortcut label, e.g. '⌘R' on mac, 'Ctrl+R' on Windows. */
+export function shortcutLabel(key: string): string {
+  return modKeyLabel() + key
+}
+
+/**
+ * True when the event is the platform's modifier chord and no other modifier
+ * is held. On mac: Meta (Cmd) without Ctrl. Elsewhere: Ctrl without Meta.
+ * altKey stays rejected on every platform: AltGr on European layouts arrives
+ * as Ctrl+Alt, and Ctrl+Alt+<key> must not hijack a typed character.
+ */
+export function isModifierChord(event: { metaKey: boolean; ctrlKey: boolean; altKey: boolean; shiftKey: boolean }): boolean {
+  if (event.altKey || event.shiftKey) return false
+  return isMacPlatform() ? event.metaKey && !event.ctrlKey : event.ctrlKey && !event.metaKey
+}