No Input String Rendered Until Valid Parse

[BismuthBloom]

Describe the bug
Clicking any key on the keypad which uses parentheses for function input (ex. (-), log, (, etc.) does not show the Input String until there is a validly parsed input.

To Reproduce
Steps to reproduce the behavior:

1. Go to the Web version of the application
2. Click on any keypad button aside from Clear, x, i, ., or a constant.
3. No input string is rendered in the Equations View.
4. Build a valid input using keypad buttons or by typing.
5. Input string is now rendered beneath the equation.

Expected behavior
Input string should showcase the input even though it does not start as valid.

Web (please complete the following information):

• Device: Macbook Pro
• OS: MacOS Tahoe 26.2
• Browser: Chrome
• Version: 144.0.7559.97

Additional context
This was also tested on Firefox as well as Safari. This also happens with pure text input, but it was first noticed on mobile with the keypad.