feat: initial fish shell configuration

- Core config layered on CachyOS base with Catppuccin Mocha theming
- Fisher plugins: fzf.fish, catppuccin, autopair, replay, puffer-fish, magic-enter, spark
- Smart CLI wrappers with fallbacks (bat, lsd, btop, dust, prettyping)
- Custom functions: git, docker, network, kitty, AI session management
- Extensive abbreviation system for keyboard-driven workflows
- Secrets/local sourcing pattern for private and machine-specific config
- README with full documentation and personalization guide
- AGPLv3+ license with copyright headers on all source files

functions/screensleep.fish

@@ -0,0 +1,12 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+function screensleep --description 'Turn off the display using KDE PowerDevil'
+    # Optional: 1-second delay to ensure no keystrokes wake it immediately
+    sleep 1
+    busctl --user call \
+        org.kde.kglobalaccel \
+        /component/org_kde_powerdevil \
+        org.kde.kglobalaccel.Component \
+        invokeShortcut s "Turn Off Screen"
+end