Session overhaul: dev tooling, cleanup, theming, fixes

Tooling:
- nh + nvd/nom/statix/deadnix/comma (new programs/nix.nix); GC via nh clean
- zoxide (cd), atuin, just, lazydocker, dust, duf, difftastic (git dft)

Structure:
- rename desktop -> konishi; homeConfigurations -> "user@host" for nh autodetect

Removals (heavy/unused):
- android-studio, unity/.NET/omnisharp/vscode, kicad, zoom, calibre,
  google-fonts, nerd-dictation

Screen recording:
- kooha + vokoscreen-ng + `webcam` corner-cam command/window-rule

Fixes:
- WEBKIT_DISABLE_DMABUF_RENDERER moved to common (electron/tauri on intel)
- kitty pinned to Catppuccin-Mocha; darkman no longer toggles kitty/claude
- claude theme dark + statusline locale fix
- ssh: migrate to settings API + multiplexing/keepalive/AddKeysToAgent;
  gpg-agent enableSshSupport
- silence hyprland configType / gtk4 / xdg userDirs deprecations

Flake hygiene:
- follows=nixpkgs for foundry/hardware/rose-pine/zen/spicetify (10->5 nixpkgs)
- zoxide _ZO_DOCTOR=0

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

home/common/programs/rust.nix

@@ -1,31 +1,33 @@
 { pkgs, ... }:
 {
-  home.packages = with pkgs; [
-    rustup
-    bacon
-    mprocs
-    pkg-config
-    openssl.dev
-    taplo
-    sccache
-    mold
-    clang
-  ];
+  home = {
+    packages = with pkgs; [
+      rustup
+      bacon
+      mprocs
+      pkg-config
+      openssl.dev
+      taplo
+      sccache
+      mold
+      clang
+    ];
 
-  home.sessionPath = [ "\${CARGO_HOME:-$HOME/.cargo}/bin" ];
+    sessionPath = [ "\${CARGO_HOME:-$HOME/.cargo}/bin" ];
 
-  home.file.".cargo/config.toml".text = ''
-    [target.x86_64-unknown-linux-gnu]
-    linker = "clang"
-    rustflags = ["-C", "link-arg=-fuse-ld=mold"]
+    file.".cargo/config.toml".text = ''
+      [target.x86_64-unknown-linux-gnu]
+      linker = "clang"
+      rustflags = ["-C", "link-arg=-fuse-ld=mold"]
 
-    [build]
-    rustflags = ["-Z", "threads=12"]
-  '';
+      [build]
+      rustflags = ["-Z", "threads=12"]
+    '';
 
-  home.sessionVariables = {
-    OPENSSL_DIR = "${pkgs.openssl.dev}";
-    OPENSSL_LIB_DIR = "${pkgs.openssl.out}/lib";
-    OPENSSL_INCLUDE_DIR = "${pkgs.openssl.dev}/include";
+    sessionVariables = {
+      OPENSSL_DIR = "${pkgs.openssl.dev}";
+      OPENSSL_LIB_DIR = "${pkgs.openssl.out}/lib";
+      OPENSSL_INCLUDE_DIR = "${pkgs.openssl.dev}/include";
+    };
   };
 }