feat(shell): add bash-style history expansions and interactive keybindings

- Replicate bash bang-operations (!^, !*, !string, etc.) via abbreviations
- Add Ctrl+G for previous path head insertion
- Add Ctrl+F for interactive history substitution
- Add Ctrl+Alt+U to quickly replace command tokens
- Update README documentation for all new features

functions/expand_typo_sub.fish

@@ -0,0 +1,23 @@
+function expand_typo_sub
+    # In newer Fish, the matched token is often passed as $argv[1] 
+    # if the abbr is set up correctly. We'll fallback to commandline just in case.
+        set -l last_cmd $history[1]
+        set -l current_token $argv[1]
+        if test -z "$current_token"
+                set current_token (commandline -t)
+        end
+    
+        if string match -qr '\^([^^]+)\^([^^]*)' -- "$current_token"
+                set -l captured (string match -r '\^([^^]+)\^([^^]*)' -- "$current_token")
+                set -l old $captured[2]
+                set -l new $captured[3]
+        
+                if test -n "$old"
+                        # Using -- to ensure strings starting with '-' aren't treated as flags
+            echo -- (string replace -a -- "$old" "$new" "$last_cmd")
+        end
+    else
+        # Return the token itself so it doesn't vanish
+                echo -- "$current_token"
+        end
+end