fix: show friendly error when repo is not found

[angeloashmore]

When a repo cannot be found (e.g. prismic repo view -r linear-gc31), the CLI throws an unhandled NotFoundRequestError instead of printing a user-friendly message.

Current behavior:

node:internal/modules/run_main:107
    triggerUncaughtException(
    ^

Za [NotFoundRequestError]: fetch failed: https://linear-gc31.prismic.io/syncState
    at Ja (file:///Users/angeloashmore/.npm/_npx/980839ecb914adeb/node_modules/prismic/dist/string-CoMDRfNA.mjs:167:54249)
    ...

Expected behavior:

A clear, human-readable error message (e.g. Repository "linear-gc31" not found.).