niri: native scratchpad via patched niri-scratchpad package

Replace the workspace-based minimize (declared 'minimized' workspace +
+1 offset + window-restore.py) with a native Sway-style scratchpad built
into niri. Ships as niri-patches/0001-scratchpad.patch + a niri-scratchpad
PKGBUILD. Mod+M stashes; Mod+Shift+M shows/toggles/cycles. Mod+1..9 no
longer offset.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pkg/niri-scratchpad/.gitignore

@@ -0,0 +1,6 @@
+src/
+pkg/
+niri/
+*.pkg.tar.*
+*.log
+0001-scratchpad.patch

pkg/niri-scratchpad/PKGBUILD

@@ -0,0 +1,48 @@
+# Maintainer: alex <funman300@gmail.com>
+pkgname=niri-scratchpad
+pkgver=26.04
+pkgrel=1
+_commit=8ed0da4
+pkgdesc="niri with a native Sway-style scratchpad (local patch set)"
+arch=('x86_64')
+url="https://github.com/YaLTeR/niri"
+license=('GPL-3.0-or-later')
+depends=('cairo' 'glib2' 'glibc' 'libdisplay-info' 'libgcc' 'libinput'
+         'libpipewire' 'libxkbcommon' 'mesa' 'pango' 'pixman' 'seatd'
+         'systemd-libs' 'xdg-desktop-portal-impl')
+makedepends=('git' 'cargo' 'clang' 'mesa')
+provides=('niri')
+conflicts=('niri')
+options=('!lto')
+source=("niri::git+https://github.com/YaLTeR/niri.git#commit=${_commit}"
+        "0001-scratchpad.patch")
+sha256sums=('SKIP'
+            'SKIP')
+
+prepare() {
+    cd niri
+    git apply "${srcdir}/0001-scratchpad.patch"
+    export RUSTUP_TOOLCHAIN=stable
+    cargo fetch --locked --target "$(rustc -vV | sed -n 's/host: //p')"
+}
+
+build() {
+    cd niri
+    export RUSTUP_TOOLCHAIN=stable
+    export CARGO_TARGET_DIR=target
+    cargo build --release --frozen
+}
+
+package() {
+    cd niri
+    install -Dm755 target/release/niri "${pkgdir}/usr/bin/niri"
+    install -Dm755 resources/niri-session "${pkgdir}/usr/bin/niri-session"
+    install -Dm644 resources/niri.desktop \
+        "${pkgdir}/usr/share/wayland-sessions/niri.desktop"
+    install -Dm644 resources/niri-portals.conf \
+        "${pkgdir}/usr/share/xdg-desktop-portal/niri-portals.conf"
+    install -Dm644 resources/niri.service \
+        "${pkgdir}/usr/lib/systemd/user/niri.service"
+    install -Dm644 resources/niri-shutdown.target \
+        "${pkgdir}/usr/lib/systemd/user/niri-shutdown.target"
+}