Extracts the shared boot/serve plumbing out of live_server into
_boot_app + _serve helpers, then adds files_overlay_server: a
function-scoped fixture that monkey-patches LEFT4ME_ROOT to tmp_path
BEFORE create_app(), seeds a files-type Overlay owned by alice, and
populates the overlay root with one editable text file, one binary
file, and one nested folder. Sets up the surface area the Tier-1
files-overlay e2e tests need without duplicating the live_server
boilerplate.
Also exposes a top-level `login(page, base_url, ...)` helper so
future test modules can share it instead of re-pasting the form-POST
flow.
Per docs/superpowers/plans/2026-05-17-files-overlay-e2e-handoff.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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