Task 0 of the terminal file viewer plan: the shared interfaces that seven
later tasks build against in parallel. Adds ViewerLocation/ViewerTargetState/
ViewerState/ViewerFile/ViewerPoll to types.ts and their invoke() wrappers to
tauri-commands.ts, creates the file_viewer Rust module (mod.rs with
MAX_VIEWER_WINDOWS/VIEWER_LABEL_PREFIX/is_viewer_label, plus placeholder
registry/resolve/poll/write/window submodules), wires it into lib.rs, and
loosens visibility on the file_commands.rs helpers the viewer commands will
reuse (MAX_READ_BYTES, validate_container_path, validate_container_write_path,
FetchedFile, fetch_container_file, require_running, clip_container_text).
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
shadowdaoandClaude Opus 5.5
3c1d120305