`data-bind:files` fails to clear native file input value when signal is reset

[jiajing21387177]

Bug Report

Description:
There is a synchronization issue with data-bind:files. While the binding correctly updates the signal when files are selected, the reverse is not true for clearing data. Programmatically resetting the signal (e.g., $files = [] or $files.length = 0) empties the reactive state but fails to reset the native DOM element's value to "".

This results in a UI mismatch: the application state behaves as if no files are selected, but the browser's file input control still displays the previous file count (e.g., "2 files").

Reproduction Steps:

1. Create an input with data-bind:files.
2. Select single or multiple files using the browser dialog.
3. Observe that the signal (e.g., $files) is correctly populated with file data.
4. Trigger an action that sets the signal to an empty array: $files = [].

Reproduction Demo: https://codepen.io/jiajing2138/pen/MYeyGpY

Expected Behavior:
The $files signal should empty and the native file input should visually reset to "No file chosen" (effectively executing input.value = "").

Actual Behavior:
The $files signal empties correctly (evidenced by reactive elements hiding/clearing), but the native <input> element retains and displays the previous file count.

Datastar Version

v1.0.0-RC.7

[jiajing21387177]

Additional Context:
This bug also breaks the ability to re-upload the same file immediately after clearing. Since the native input value remains set to the previous filename, selecting the same file again does not trigger a DOM change event. Consequently, the Datastar signal is not updated, and the application remains in an empty state despite the user's action.

[nickchomey]

<button class="clear-btn" data-on:click="document.getElementById('fileinput').value = '';$files.length=0">

If you add an ID to the input, this will work. Though, you already knew that.

Hopefully datastar will be able to do a 2-way binding with file input elements