consider integrating local-storage-full warning message into save button

[tyrasd]

From #8942 (reply in thread):

It could make sense to show the warning for a full local storage not in the status bar (rendered similar as the OSM API unavailable message), but somehow integrate it into the save button. There are some reasons behind it:

• The warning can take up too much screen estate while mapping
• The save button is already used as an indicator when one should save. There could be an additional step in the states of the button (e.g. indicated by a ⚠️ symbol) to show that saving is really recommended when local storage is full
• The bottom status bar should be reserved for proper "error" states, e.g. when the OSM API is not available

[CorruptComputer]

Just wanted to add this info here in case its useful, apparently you can get 50mb of storage by using the IndexedDB API instead of localStorage: https://stackoverflow.com/a/37277426

Would it be a possibility for iD to use this to store the changes?

[bhousel]

Would it be a possibility for iD to use this to store the changes?

Yep thats #3239