update notes import and export file type to jsonl

[sutterseba]

Changes the file type of notes exports to .jsonl (JSON Lines), which is a more common format used by compatible wallets as specified in BIP-329.

For example, exporting labels with Sparrow Wallet creates a .jsonl, which would previously have to be renamed manually in order to allow importing it in the BitBoxApp.

The supported import file types are updated accordingly, still allowing .txt imports for exports created prior to this change.

[benma]

I assume this also needs to be extended:

bitbox-wallet-app/frontends/android/BitBoxApp/app/src/main/java/ch/shiftcrypto/bitboxapp/MainActivity.java

Lines 356 to 358 in 1e5ec74

	// import notes form uses .txt file type, but is not supported here.
	if (".txt".equals(mimeTypes[0])) {
	fileType = "text/plain";

[sutterseba]

@benma PTAL, change assumes that getAcceptTypes() returns two elements .jsonl and .txt (not ".jsonl,.txt" as a single one). The latter should not happen afaiu but I can't really test on Android.

(Kept the existing check to map to a single valid type)

[thisconnect]

tested a6d1b3e on Android.

Importing .txt worked. somehow I can only see .txt and not .jsonl. If I browse to Downloads, I can see the .jsonl file but grayed out. Only the txt file is selectable.

[sutterseba]

The (android) filer picker shows .jsonl files as binary (i.e. it doesn't recognize it), so I opted to remove the file type restriction now. In notes import, any file should be able to be selected again. Not ideal, but restricting the picker to only allow .txt and .jsonl would probably require a more involved change.

[sutterseba]

rebased, sry forgot to re-request review

[thisconnect]

The (android) filer picker shows .jsonl files as binary (i.e. it doesn't recognize it), so I opted to remove the file type restriction now. In notes import, any file should be able to be selected again. Not ideal, but restricting the picker to only allow .txt and .jsonl would probably require a more involved change.

It would be still very nice to have the filter-by-file-type so that it only shows supported files (.txt and .jsonl).