[FEATURE REQUEST] Improvement: Store Capture if Note Creation fails

[alexbaron-me]

Is your feature request related to a problem? Please describe.
When trying to create a new note which contains an invalid character (in my case a ':'), a notification is shown that the note could not be created. However, the actual capture is lost, which can be very frustrating.

Describe the solution you'd like
Different ideas come to mind: either a warning could be shown in the capture dialog, stating that the input cannot be captured since it contains invalid characters. Alternatively, the input could be stored in the users clipboard whenever file creation fails. This would probably be the more robust solution, since it also handles FS issues etc.

Describe alternatives you've considered
Simply not inputting invalid characters is of course an alternative, but that would mean that every user has to stub their toe on this problem at least once.

Additional context
I am happy to implement a PR for this if your workload is to high - please indicate if that's the case.