Fix: URL-encode spaces in database path for macOS

[chadfryer]

Summary

One-line fix: URL-encode spaces in the DATABASE_URL passed to the Node.js sidecar.

Root cause

macOS stores app data at ~/Library/Application Support/ — note the space. The v0.2.1 fix correctly copies the database there, but passes the raw path to Prisma via DATABASE_URL=file:/path/Application Support/dev.db. Prisma's URL parser rejects the unencoded space, causing every database query to fail silently. The library API returns a 500 error, and the UI shows "No sessions available."

Fix

// Before
.env("DATABASE_URL", format!("file:{}", db_path.display()))

// After  
.env("DATABASE_URL", format!("file:{}", db_path.display().to_string().replace(' ', "%20")))

Bumps to v0.2.2.

[GigaChadGRC]

lgtm