agama-project / agama / 23241971398

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fix(web): displays "Unknown" for missing hardware values (#3294)

## Problem

When the API does not return some hardware values, the corresponding
fields in the system information card display blank, which could mislead
users into thinking the UI is broken.


## Solution

Display "Unknown" as a fallback for missing or undefined hardware
fields, so users can easily understand that Agama could not retrieve the
value rather than assuming a UI error.

## Additional work

While working on this, the `SystemInformationSection` component was also
cleaned up.

Also, a table-based alternative was explored to improve screen reader
support, but was rejected as it might cause a double label announcement
(probably easy to fix) and background styling conflicts with the wrapper
component background.

## Testing

- Added unit tests.
- Tested manually too.

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