fix(native-chat): show prompts sent mid-turn and ! commands where Claude read them (#31204)

Co-authored-by: Paweł Kotowski <p.kotowski89@gmail.com>

src/shared/claude-bash-input.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest'
+import { claudeBashInputAsTypedCommand } from './claude-bash-input'
+
+describe('claudeBashInputAsTypedCommand', () => {
+  it('restores the line as typed, keeping the space after `!`', () => {
+    expect(claudeBashInputAsTypedCommand('<bash-input> gcloud auth login</bash-input>')).toBe(
+      '! gcloud auth login'
+    )
+    expect(claudeBashInputAsTypedCommand('<bash-input>ls -la</bash-input>')).toBe('!ls -la')
+  })
+  it.each([
+    'run <bash-input>ls</bash-input>',
+    '<bash-input>ls</bash-input> and more',
+    '<bash-stdout>ok</bash-stdout>',
+    '<bash-input>a</bash-input><bash-input>b</bash-input>'
+  ])('leaves anything else alone (%s)', (text) => {
+    expect(claudeBashInputAsTypedCommand(text)).toBeNull()
+  })
+})

src/shared/claude-bash-input.ts

@@ -0,0 +1,18 @@
+import type { NativeChatBlock } from './native-chat-types'
+
+const BASH_INPUT = /^\s*<bash-input>([\s\S]*)<\/bash-input>\s*$/
+
+/** Claude records a `!` shell command as `<bash-input>cmd</bash-input>`, with the `!`
+ *  stripped. Returns the line as typed, or null when the text is anything else. */
+export function claudeBashInputAsTypedCommand(text: string): string | null {
+  const command = BASH_INPUT.exec(text)?.[1]
+  return command === undefined || command.includes('<bash-input>') ? null : `!${command}`
+}
+
+export function unwrapClaudeBashInputBlock(block: NativeChatBlock): NativeChatBlock {
+  if (block.type !== 'text') {
+    return block
+  }
+  const typed = claudeBashInputAsTypedCommand(block.text)
+  return typed === null ? block : { ...block, text: typed }
+}