Restore fish startup timing prompt

Author: Braden1996

dot_config/fish/conf.d/00-env.fish

@@ -27,8 +27,16 @@ if set -q MANPATH[1]
     set -gx MANPATH "" $MANPATH
 end
 
-# Prefer a terminal-provided startup timestamp so Fish startup avoids extra
-# subprocesses just to measure prompt latency.
+# Prefer a terminal-provided startup timestamp. Fall back to a one-time
+# timestamp capture so the initial Starship right prompt can still show shell
+# startup duration outside terminal wrappers like Ghostty.
+if status is-interactive; and not set -q __BRADEN_SHELL_START_REAL
+    if command -q perl
+        set -gx __BRADEN_SHELL_START_REAL (command perl -MTime::HiRes=time -e 'printf "%.6f\n", time')
+    else if command -q python3
+        set -gx __BRADEN_SHELL_START_REAL (command python3 -c 'import time; print(f"{time.time():.6f}")')
+    end
+end
 
 if test -d /Library/Java/JavaVirtualMachines/zulu-17.jdk/Contents/Home
     set -gx JAVA_HOME /Library/Java/JavaVirtualMachines/zulu-17.jdk/Contents/Home