Fix null reference error when sending files using the extension

[nidhal-labidi]

Description

There is a null reference error (TypeError: Cannot read properties of null (reading 'files')) when attempting to send files via the extension.
This issue occurs because the DOM has not fully rendered before the onMount function executes, and the inputField is accessed prematurely. The task is to ensure that the file input is accessible before initialization.

Links / References

tick()

Tasks / Definition of Done

• Use tick() in onMount to wait for DOM rendering.
• Ensure that the file input field is accessible before starting the connection process

Further information

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