fix(files): prevent fatal TypeError crash on unauthenticated cloud ac…

[vibhutomer]

Fix: Prevent Fatal App Crash on Unauthenticated Cloud Access

Related Issue

• Closes Fatal React Crash (TypeError) on Unauthenticated Cloud Access #78

Description of Changes

• Fixed a critical oversight in the temp() function inside Files.tsx.
• Previously, if a user who wasn't logged in clicked the Cloud files icon, the app would alert them but continue executing the function. This resulted in Object.keys(undefined), throwing a fatal TypeError that crashed the entire React DOM.
• Added setListFiles(false) and a return; statement inside the !user condition block.

Impact

• Crash Prevention: The app no longer "White Screens" when an unauthenticated user tries to interact with cloud features.
• Data Safety: Prevents users from losing unsaved spreadsheet data due to an unexpected UI crash.
• Graceful Failure: The operation is now safely aborted, and the modal state is reset properly.