Interface refactor + breadcrumbs, reset, and options persistence

[BrandonZacharie]

Summary

Four previously-unpushed local commits, rebased onto current main:

• Show breadcrumbs for fileprompts — replace flat menu titles with a ↳ A 〉B breadcrumb trail; menu titles become Sequence[str].
• Refactor to organize interface logic — extract curses-facing code from chess.py into a new interface/ package (game.py, menu.py, input.py, draw.py). chess.py shrinks from a monolith to a slim entry point.
• Add menu option to reset config — introduce a Label StrEnum for UI strings; add a "factory reset" entry that clears game state and resets the configuration.
• Persist options file to user home directory — Configuration now reads/writes ~/.chessrc; setting log_style persists immediately. Includes round-trip tests (write-on-create, read-existing, set-persists-and-reloads) and an autouse fixture that isolates Path.home() to tmp_path so tests don't touch the real home directory.

Notes on the rebase

The refactor commit predated several merged PRs, so straight replay would have silently regressed them. Carried forward into the new interface/ modules:

• case key if 0 <= key < 0x100 guard in fileprompt (PR Add UI tests for chess.py and fix four latent bugs they exposed #1)
• panel.hide() runs once on display() exit, not after every keypress (PR Add UI tests for chess.py and fix four latent bugs they exposed #1)
• len(self.pages) - 1 clamp in Menu.navigate() (PR Add cli.py UI tests, mark slow PGN tests, fix promotion filter #2)
• self.items = list(items) to avoid shared-list mutation (PR Add cli.py UI tests, mark slow PGN tests, fix promotion filter #2)

Also standardized on from curses import window as Window throughout (removed the now-redundant interface/curses.py TYPE_CHECKING shim), and kept Chess._fileprompt as a thin wrapper over interface.input.fileprompt so existing monkey-patching tests work unchanged.

Test plan

• Full test suite passes (216 passed, 2 deselected)
• import chess succeeds against the new package layout
• Manual smoke: run python chess.py and exercise new game / save / load / options / factory reset / about
• Confirm ~/.chessrc is created on first run and re-read on subsequent runs

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