Fix SelectList crash on narrow terminal and thinking level restoration

SelectList fixes:
- Use hardcoded visual width for arrow prefix instead of string length
  which includes ANSI codes
- Truncate scroll indicator text to prevent exceeding terminal width
- Fixes crash when terminal is resized narrow and arrow keys are pressed

Thinking level fix:
- Restore thinking level even if it's "off" (removed !== "off" check)
- This ensures the thinking level selector shows the correct state on continue

packages/coding-agent/src/main.ts

@@ -230,7 +230,7 @@ export async function main(args: string[]) {
 
 		// Load and restore thinking level
 		const thinkingLevel = sessionManager.loadThinkingLevel() as ThinkingLevel;
-		if (thinkingLevel && thinkingLevel !== "off") {
+		if (thinkingLevel) {
 			agent.setThinkingLevel(thinkingLevel);
 			console.log(chalk.dim(`Restored thinking level: ${thinkingLevel}`));
 		}