refactor: replace ugly semicolon-prefix type-cast syntax with proper const declarations

Replace ;(x as any).method?.() pattern with cleaner const + conditional check pattern:
- Extract type-cast to named const variable
- Use explicit if-statement or ternary instead of optional chaining on cast

Affected files:
- chat.tsx: flushed promise handling
- multiline-input.tsx: focus method call
- use-clipboard.ts: getSelection call
- markdown-renderer.tsx: table row iteration
- terminal-color-detection.ts: stream close calls

Author: brandonkachen

cli/src/chat.tsx

@@ -237,7 +237,8 @@ export const App = ({
 
       const flushed = flushAnalytics()
       if (flushed && typeof (flushed as Promise<void>).finally === 'function') {
-        ;(flushed as Promise<void>).finally(() => process.exit(0))
+        const flushedPromise = flushed as Promise<void>
+        flushedPromise.finally(() => process.exit(0))
       } else {
         process.exit(0)
       }
@@ -260,7 +261,8 @@ export const App = ({
 
     const flushed = flushAnalytics()
     if (flushed && typeof (flushed as Promise<void>).finally === 'function') {
-      ;(flushed as Promise<void>).finally(() => process.exit(0))
+      const flushedPromise = flushed as Promise<void>
+      flushedPromise.finally(() => process.exit(0))
     } else {
       process.exit(0)
     }

cli/src/components/multiline-input.tsx

@@ -116,7 +116,8 @@ export const MultilineInput = forwardRef<
       focus: () => {
         const node = scrollBoxRef.current
         if (node && typeof (node as any).focus === 'function') {
-          ;(node as any).focus()
+          const focusableNode = node as any
+          focusableNode.focus()
         }
       },
     }),

cli/src/hooks/use-clipboard.ts

@@ -31,7 +31,8 @@ export const useClipboard = () => {
 
   useEffect(() => {
     const handleSelection = (selectionEvent: any) => {
-      const selectionObj = selectionEvent ?? (renderer as any)?.getSelection?.()
+      const rendererAny = renderer as any
+      const selectionObj = selectionEvent ?? (rendererAny?.getSelection ? rendererAny.getSelection() : undefined)
       const rawText: string | null = selectionObj?.getSelectedText
         ? selectionObj.getSelectedText()
         : typeof selectionObj === 'string'

cli/src/utils/markdown-renderer.tsx

@@ -673,7 +673,8 @@ const renderTable = (table: Table, state: RenderState): ReactNode[] => {
   // Calculate column widths
   const columnWidths: number[] = []
   table.children.forEach((row) => {
-    ;(row as TableRow).children.forEach((cell, colIdx) => {
+    const tableRow = row as TableRow
+    tableRow.children.forEach((cell, colIdx) => {
       const cellText = nodeToPlainText(cell as TableCell)
       const width = cellText.length
       columnWidths[colIdx] = Math.max(columnWidths[colIdx] || 0, width)

cli/src/utils/terminal-color-detection.ts

@@ -117,7 +117,10 @@ function queryTerminalOSC(oscCode: number): Promise<string | null> {
           readStream.removeListener('error', onError)
           try {
             // Prefer close() so stream owns its FD lifecycle
-            ;(readStream as any).close?.()
+            const stream = readStream as any
+            if (stream.close) {
+              stream.close()
+            }
           } catch {}
           cleanup()
           resolve(response)
@@ -128,7 +131,10 @@ function queryTerminalOSC(oscCode: number): Promise<string | null> {
         readStream.removeListener('data', onData)
         readStream.removeListener('error', onError)
         try {
-          ;(readStream as any).close?.()
+          const stream = readStream as any
+          if (stream.close) {
+            stream.close()
+          }
         } catch {}
         cleanup()
         resolve(null)
@@ -146,7 +152,10 @@ function queryTerminalOSC(oscCode: number): Promise<string | null> {
         readStream.removeListener('data', onData)
         readStream.removeListener('error', onError)
         try {
-          ;(readStream as any).close?.()
+          const stream = readStream as any
+          if (stream.close) {
+            stream.close()
+          }
         } catch {}
         cleanup()
         resolve(null)