fix(nix,zsh): tuicr flake schema + restore XDG_DATA_DIRS

tuicr's upstream flake uses the legacy 'defaultPackage.<system>' output
schema, not 'packages.<system>.default' — fixes the home-manager switch
error 'attribute packages missing' at nix/flake.nix:28.

zsh: removing the system zsh package took /etc/zsh/zprofile with it,
which used to 'source /etc/profile' and pull in /etc/profile.d/*.sh
(flatpak.sh, nix.sh, etc.). Reconstruct XDG_DATA_DIRS in dot_zprofile
defensively, including per-user + system flatpak exports + nix-profile
share, so 'flatpak update' stops warning and desktop entries from
flatpak/nix-installed apps work in launchers (fuzzel).

3 files changed, 132 insertions, 2 deletions

diff --git a/dot_config/zsh/dot_zprofile b/dot_config/zsh/dot_zprofile
index 66e97cd..b0f7089 100644
--- a/dot_config/zsh/dot_zprofile
+++ b/dot_config/zsh/dot_zprofile
@@ -20,6 +20,15 @@ export XDG_DATA_HOME="$HOME/.local/share"
 export XDG_STATE_HOME="$HOME/.local/state"
 export XDG_CACHE_HOME="$HOME/.cache"
 
+# Pull in /etc/profile + /etc/profile.d/*.sh. The Arch zsh package used
+# to ship /etc/zsh/zprofile doing exactly this, but we removed system
+# zsh in favour of nix's zsh, so we replicate it here. This is how
+# flatpak (XDG_DATA_DIRS for app launchers), nix-daemon, locale, etc.
+# inject themselves into login shells. Sourced AFTER our PATH setup so
+# `typeset -U path` keeps nix-profile/bin + ~/.local/bin at the front
+# even if /etc/profile.d snippets try to prepend duplicates.
+[[ -r /etc/profile ]] && emulate sh -c 'source /etc/profile'
+
 # ── Locale ────────────────────────────────────────────────────────────────────
 export LANG=en_US.UTF-8
 
diff --git a/nix/flake.lock b/nix/flake.lock
index 7b633fb..4639d61 100644
--- a/nix/flake.lock
+++ b/nix/flake.lock
@@ -1,5 +1,28 @@
 {
   "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "tuicr",
+          "naersk",
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1752475459,
+        "narHash": "sha256-z6QEu4ZFuHiqdOPbYss4/Q8B0BFhacR8ts6jO/F/aOU=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "bf0d6f70f4c9a9cf8845f992105652173f4b617f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
     "home-manager": {
       "inputs": {
         "nixpkgs": [
@@ -21,6 +44,29 @@
         "type": "github"
       }
     },
+    "naersk": {
+      "inputs": {
+        "fenix": "fenix",
+        "nixpkgs": [
+          "tuicr",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1769799857,
+        "narHash": "sha256-88IFXZ7Sa1vxbz5pty0Io5qEaMQMMUPMonLa3Ls/ss4=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "9d4ed44d8b8cecdceb1d6fd76e74123d90ae6339",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "ref": "master",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1778869304,
@@ -40,7 +86,80 @@
     "root": {
       "inputs": {
         "home-manager": "home-manager",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "tuicr": "tuicr"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1752428706,
+        "narHash": "sha256-EJcdxw3aXfP8Ex1Nm3s0awyH9egQvB2Gu+QEnJn2Sfg=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "591e3b7624be97e4443ea7b5542c191311aa141d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "tuicr": {
+      "inputs": {
+        "naersk": "naersk",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "utils": "utils"
+      },
+      "locked": {
+        "lastModified": 1779404076,
+        "narHash": "sha256-WkPMecljTG/cEg2+AAgCk92ta8Gs2UhY32n2u6h7eU0=",
+        "owner": "agavra",
+        "repo": "tuicr",
+        "rev": "35ecbe2863d7a0a5321612bf6bb955006fab24c2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "agavra",
+        "repo": "tuicr",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
       }
     }
   },
diff --git a/nix/flake.nix b/nix/flake.nix
index 9e26edb..ca2ad66 100644
--- a/nix/flake.nix
+++ b/nix/flake.nix
@@ -25,7 +25,9 @@
         overlays = [
           # Expose `pkgs.tuicr` so common.nix can list it next to other
           # packages without threading inputs into every module.
-          (final: prev: { tuicr = tuicr.packages.${system}.default; })
+          # tuicr's flake uses the legacy `defaultPackage.<system>`
+          # schema (not `packages.<system>.default`); see its flake.nix.
+          (final: prev: { tuicr = tuicr.defaultPackage.${system}; })
         ];
         # Whitelist specific unfree packages (claude-code,
         # github-copilot-cli) instead of globally setting allowUnfree,