chore: bump version to 0.1.4

fix(nix): use `types.path` instead of `types.externalPath` in modules

This reverts commit 85aef499499c19f140623981a85497de15f1a570.

chore: bump version to 0.1.3

ci: add cachix binary cache `olduser101`

doc: move defaults into examples directory

build(flake): update input `nixpkgs`

feat(render): rename input `hideWhenEmpty` to `visible`, extra modes

- rename the input configuration key `hideWhenEmpty` to `visible`
- add an extra mode to always hide the input box

refactor(auth): use pipe communication, remove async dependencies

state changed event was used as part of auth callback, which is
no longer present

replace tokio with standard threads since fits more cleanly with
the nlock structure, and reduces dependencies

chore: bump version to v0.1.1

feat: add version command and build script

feat(nix): add NixOS and home-manager modules

refactor(nix): split into separate files

refactor(util): move `LogLevel` enum into `util` module

- move `LogLevel` to `util`, with other arg-related enums
- impl `From<LogLevel>` on `tracing::level_filters::LevelFilter`
to simplify conversion.

refactor(args): use `clap-derive` for argument parsing

- use `clap-derive` to define args via structs, much
simpler than the builder.

fix: handle multi-byte unicode characters in password string

- calculate password length in codepoints, not bytes, which produces
incorrect lengths when multi-byte unicode chars are entered.

closes #48

feat(config): reject unknown configuration fields

closes #46

feat(image): use cairo conversion for png images, reduce pixbuf overhead

- cairo natively supports png images, so create cairo surfaces from
them directly, instead of going through pixbuf, which is wasteful.
- add `detect_png` utility function to determine if a file is png based
on file signature

closes #44

fix(render): correctly scale overlay ui elements

- scale ui elements on the overlay by the output scale

Closes #39

fix(surface): use synchronised surfaces to avoid Hyprland quirk

- always use sync subsurfaces, due to a quirk with desync
subsurfaces on Hyprland, preventing redraw
- always commit background surface to allow overlay to update
(sync surfaces)
- only commit new buffer when required

Closes #38

refactor(render): move rendering to separate module

- move renderer to new `NLockRenderer` struct
- move rendering enums into `util` module
- clean up `surface` module

chore: update license headers

chore: fix license header?

build(nix): install shell completions in `postInstall`

feat: add subcommand for shell completion generation