fix(zellij): fix CWD tracking in fish for zellij tabs

docs/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## 2026-08-16
 
+- Fixed Zellij new tab directory tracking by adding `__fish_update_cwd_osc` override in `presets/programs/zellij.nix`. Fish's default OSC 7 sequence includes `$hostname`, which on macOS or dynamic network environments evaluates to `Noah-MacBook-Pro.local` or a domain suffix. Zellij compares the OSC 7 hostname against its system hostname (`Noah-MacBook-Pro`), finds a mismatch, and silently ignores the CWD update, leaving new tabs stuck in a previous directory or session default. Overriding `__fish_update_cwd_osc` to send `file://<PWD>` (empty hostname) ensures Zellij always updates its cached CWD on every `cd` and prompt render.
 - Fixed Firefox "profile cannot be loaded" error on macOS by removing `home.file."Library/Application Support/Firefox/installs.ini"`. Hardcoding an installation hash in `installs.ini` broke whenever Firefox was updated or rebuilt in the Nix store because the nix store path changed, causing Firefox to compute a new installation hash, fail to match or write to the read-only `installs.ini` symlink, and error out. Firefox on macOS uses `profiles.ini` (managed by Home Manager) and `MOZ_LEGACY_PROFILES=1` (exported by nixpkgs' launcher wrapper).
 
 ## 2026-08-03

platforms/home-manager/modules/nmasur/presets/programs/zellij.nix

@@ -75,6 +75,17 @@ in
               ${lib.getExe pkgs.zellij} action new-pane --start-suspended -- gh run watch
             '';
         };
+        __fish_update_cwd_osc = {
+          description = "Notify Zellij/terminal of CWD changes without hostname mismatch";
+          body = # fish
+            ''
+              if test "$TERM" != "dumb"
+                  printf \e\]7\;file://%s\a (string escape --style=url -- $PWD)
+              end
+            '';
+          onVariable = "PWD";
+          onEvent = "fish_prompt";
+        };
       };
     };