fix(ui): upload file size could not be parsed

[ym]

Fixes #1004

[Copilot]

Pull request overview

This PR fixes an issue where upload file sizes could not be parsed properly by refactoring how file metadata (particularly dates) are stored and formatted. The key change is storing dates as Date objects in the component state instead of pre-formatted strings, allowing for more flexible formatting at display time.

Key Changes

• Added isInvalidDate helper function to safely handle invalid Date objects in the date formatter
• Changed StorageFile.createdAt type from string to Date to store raw Date objects instead of formatted strings
• Updated file list mapping to store Date objects directly, moving date formatting to the display layer

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
ui/src/utils.ts	Added invalid date handling to the date formatter and fixed formatting/whitespace
ui/src/routes/devices.$id.mount.tsx	Introduced StorageFile interface and changed date storage from formatted strings to Date objects

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