fix: windows fallback for "less" cmd in `session list`

[itsrainingmani]

Since Bun.Shell doesn't natively implement less, we use fallbacks to determine the best option on Windows -

We try to locate less.exe from:

• The OPENCODE_GIT_BASH_PATH custom location
• The Git installation directory (found via git in PATH)

if less cannot be located, we finally fall back to the built-in more command.