I have pretty clean install of Windows 10 going here (N version, in fact). Issue is there with WD off, tons of services disabled, so on and so forth.
I gave up a bit ago, but just tried again with version 0.6.0 (thanks for sharing that, by the way). The issue that pops out immediately, is the database error popups when deleting the "Welcome To Cosmic Everyday" notebook. The error messages are not descriptive (more generic/agnostic than anything).
I had a look in the standard NWJS/Chromium based app data storage (for Windows at least), %appdata%\Local\CosmicEveryday, to see if I could find any logs or errors reports. The CrashPad directory was present, but was empty (which tells me there isn't really any debugging on errors, outside of those toasts). Any other suggestions for viewing any sort of logs? Something in human readable format, where I don't have to install 3 apps and attach debuggers and such?