feat(v0.2): multi-tab terminal + titles + Claude Code shortcut bar

Frontend feature (backend unchanged — manager was already multi-session):
- Multi-tab: each tab = independent WS + Terminal + session (terminal-session.ts,
  tabs.ts); tab bar with +, ×, middle-click close; persisted to localStorage
  (migrates v0.1 single-session key)
- Tab titles: auto from xterm onTitleChange (OSC 0/2), double-click to rename
  inline (manual wins over auto); ellipsis + tooltip
- Shortcut key bar now shown on ALL devices (clickable buttons trigger shortcuts),
  reordered for Claude Code (Esc prominent, ⇧Tab, ↑↓, ⏎, ^C, Tab, ←→, /);
  responsive sizing via @media (pointer:coarse) for touch
- Verified in browser: rename, two independent sessions, keybar on desktop +
  narrow viewport. 191 tests green; both typechecks + esbuild build pass.

test/keybar.test.ts

@@ -11,7 +11,7 @@
  */
 
 import { describe, it, expect } from 'vitest'
-import { KEY_MAP } from '../public/keybar.js'
+import { KEY_MAP, KEYBAR_BUTTONS } from '../public/keybar.js'
 
 describe('keybar', () => {
   describe('KEY_MAP — pure byte mappings', () => {
@@ -73,7 +73,12 @@ describe('keybar', () => {
       expect(KEY_MAP.tab.charCodeAt(0)).toBe(0x09)
     })
 
-    it('all 9 keys are defined', () => {
+    it('slash maps to / (Claude Code slash-command launcher)', () => {
+      expect(KEY_MAP.slash).toBe('/')
+      expect(KEY_MAP.slash).toHaveLength(1)
+    })
+
+    it('all 10 keys are defined', () => {
       const keys = Object.keys(KEY_MAP)
       expect(keys).toEqual([
         'esc',
@@ -85,13 +90,14 @@ describe('keybar', () => {
         'enter',
         'ctrlC',
         'tab',
+        'slash',
       ])
     })
 
     it('all mapped bytes are unique strings', () => {
       const bytes = Object.values(KEY_MAP)
-      expect(bytes).toHaveLength(9)
-      expect(new Set(bytes).size).toBe(9) // all unique
+      expect(bytes).toHaveLength(10)
+      expect(new Set(bytes).size).toBe(10) // all unique
     })
 
     it('ANSI arrow sequences use correct format', () => {
@@ -103,4 +109,24 @@ describe('keybar', () => {
       })
     })
   })
+
+  describe('KEYBAR_BUTTONS — layout', () => {
+    it('every button references a valid KEY_MAP key', () => {
+      for (const b of KEYBAR_BUTTONS) {
+        expect(KEY_MAP[b.keyName]).toBeDefined()
+      }
+    })
+
+    it('Esc is first and marked primary (most-used interrupt)', () => {
+      expect(KEYBAR_BUTTONS[0]?.keyName).toBe('esc')
+      expect(KEYBAR_BUTTONS[0]?.primary).toBe(true)
+    })
+
+    it('exposes all Claude Code keys as buttons', () => {
+      const keys = KEYBAR_BUTTONS.map((b) => b.keyName)
+      expect(keys).toContain('shiftTab')
+      expect(keys).toContain('slash')
+      expect(keys).toContain('arrowUp')
+    })
+  })
 })