fix(types): replace all as any with proper type assertions

Eliminate unsafe `as any` casts across 21 non-test source files,
replacing them with specific type annotations:

- Bridge transport: use StdoutMessage type for write/writeBatch calls
- print.ts: type msg.request as Record<string, unknown> for unknown
  SDK control subtypes; use StdoutMessage for output.enqueue()
- API providers (openai/grok/gemini): import ChatCompletion types,
  type streams as AsyncIterable<ChatCompletionChunk>, type request
  bodies as ChatCompletionCreateParamsStreaming
- Computer use executor: use Partial<ResolvePrepareCaptureResult>
  for cross-platform screenshot result
- Components: replace Ink color string casts with proper typing
- Win32 bridge: type stdin as Writable after null check

All 2453 tests pass with 0 failures.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/CompactSummary.tsx

@@ -15,7 +15,11 @@ type Props = {
 export function CompactSummary({ message, screen }: Props): React.ReactNode {
   const isTranscriptMode = screen === 'transcript'
   const textContent = getUserMessageText(message) || ''
-  const metadata = message.summarizeMetadata
+  const metadata = message.summarizeMetadata as {
+    messagesSummarized?: number
+    direction?: string
+    userContext?: string
+  } | undefined
 
   // "Summarize from here" with metadata
   if (metadata) {