Feat: Add syntax highlighting for a lot more languages

samples/fish.fish

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+#!/usr/bin/env fish
+# Fish highlighting torture test 🐟
+
+# === Variables ===
+set normal_var "hello"
+set -l local_var 123
+set -gx GLOBAL_VAR "world"
+set PATH $PATH /usr/local/bin
+set --erase OLD_VAR
+
+# Builtin variables
+echo $HOME $PWD $USER $FISH_VERSION
+
+# === Strings ===
+set single 'single quoted string'
+set double "double quoted $normal_var"
+set escaped "newline\n tab\t dollar\$"
+
+# === Conditionals ===
+if test $normal_var = "hello"
+    echo "equal"
+else if test $normal_var != "world"
+    echo "not equal"
+end
+
+# === Logical operators ===
+true and echo "yes"
+false or echo "fallback"
+not false
+
+# === Arithmetic ===
+set x 10
+set y 20
+math "$x + $y"
+if test (math "$x * 2") -gt 15
+    echo "math works"
+end
+
+# === Loops ===
+for i in 1 2 3
+    echo "loop $i"
+end
+
+while test $x -gt 0
+    set x (math "$x - 1")
+end
+
+# === Functions ===
+function greet --argument name
+    echo "Hello $name"
+end
+
+greet "world"
+
+# === Command substitution ===
+set files (ls | grep ".fish")
+
+# === Redirections ===
+echo "output" > /tmp/fish_test.txt
+cat < /tmp/fish_test.txt >> /tmp/fish_log.txt
+
+# === Process substitution ===
+diff (ls /bin) (ls /usr/bin)
+
+# === Case statement ===
+switch $argv[1]
+    case start
+        echo "Starting"
+    case stop
+        echo "Stopping"
+    case '*'
+        echo "Unknown"
+end
+
+# === Subshell ===
+begin
+    echo "inside begin/end"
+end
+
+# === Comments & operators ===
+# && || | & ! should all highlight
+true && echo "ok" || echo "fail"
+
+# === Regex ===
+string match -r '^[a-z]+$' "hello"
+
+# === Test builtin ===
+test -f /etc/passwd
+test ! -d /does/not/exist
+
+# === Exit ===
+exit 0