Fix error-display and spinner type safety

Author: jdalton

src/utils/error-display.mts

@@ -58,7 +58,7 @@ export function formatErrorForDisplay(
     // Handle error causes (chain of errors).
     if (error.cause && showStack) {
       const causeLines = []
-      let currentCause = error.cause
+      let currentCause: unknown = error.cause
       let depth = 1
 
       while (currentCause && depth <= 5) {

src/utils/spinner.mts

@@ -38,7 +38,7 @@ function renderSpinner(state: SpinnerState): void {
   }
 
   const frame = SPINNER_FRAMES[state.frame % SPINNER_FRAMES.length]
-  const text = `${colors.cyan(frame)} ${state.message}`
+  const text = `${colors.cyan(frame ?? '')} ${state.message}`
 
   // Clear line and write spinner.
   process.stderr.write(`\r\x1b[K${text}`)