fix: stack overflow when scanning large number of JSONL (SUPER TINY PR +1-1)

[purelledhand]

Summary

• Fix stack overflow error when users have 65k+ JSONL files in ~/.claude/projects
• Replace spread operator with for loop to avoid call stack limit

Problem

Users with many JSONL files (100k+) see "No usage history found" even though files exist.

Root cause: allFiles.push(...files) causes "Maximum call stack size exceeded" when the array has more than ~65,536 elements. The catch block silently swallows this error, making it appear as if no files were found.

Solution

Replace the spread operator with a for loop:

// Before (causes stack overflow with large arrays)
allFiles.push(...files);

// After (safe for any array size)
for (const file of files) allFiles.push(file);

Testing

Tested with 106,000+ JSONL files:
- Before fix: "No usage history found"
- After fix: "Found 145,074 usage entries" ✅