hypr,nvim,quickshell: make configs live-editable

Symlink three configs straight from the repo with mkOutOfStoreSymlink so
edits apply without a rebuild:

- home/hypr/hyprland.lua  -> reload with `hyprctl reload`
- home/hypr/quickshell/** -> restart quickshell
- home/nvim/config/**     -> next nvim start (lazy-lock.json now writable)

Hyprland's config was generated Lua; extract it to a hand-maintained file
and keep the palette and per-host monitors as generated fragments
(theme.lua / monitors.lua) loaded via dofile. The file also restores the
startup hook that imports the Wayland env into systemd and starts
graphical-session.target, which the removed home-manager hyprland module
used to provide.

Verified: lua syntax + execution against a stub hl, and flake check.

home/hypr/quickshell.nix

@@ -1,4 +1,10 @@
-{ pkgs, inputs, ... }:
+{
+  pkgs,
+  inputs,
+  config,
+  my,
+  ...
+}:
 
 let
   quickshellPkg =
@@ -16,11 +22,10 @@ in
 {
   # Quickshell overview module for Hyprland (Super+Tab workspace overview).
   # Vendored from: https://github.com/Shanu-Kumawat/quickshell-overview
-  # Placed at the quickshell config root so a bare `qs` finds shell.qml.
-  xdg.configFile."quickshell" = {
-    source = ./quickshell;
-    recursive = true;
-  };
+  # Symlinked straight from the repo so edits are live; placed at the
+  # quickshell config root so a bare `qs` finds shell.qml.
+  xdg.configFile."quickshell".source =
+    config.lib.file.mkOutOfStoreSymlink "${my.flakeDir}/home/hypr/quickshell";
 
   # Run quickshell as a systemd user service tied to the Wayland session.
   programs.quickshell = {