fix(notification): read the inbox by default and stream watch as NDJSON

notification commands required a repository unless --mine was given.
They now act on the account's inbox (D17); -R, TEA_REPO or the new
--this-repo limit them to one repository, and --mine is a hidden no-op.

notification list is a table with ID, TYPE, REPOSITORY, SUBJECT ("#17
Improve greeting", bold when unread), STATE and UPDATED, a "Showing N of
M" line and an empty message on a terminal; piped rows add the status
and the URL. The ID links to the subject. JSON gains the subject number.

notification view shows the subject, its state and the latest comment,
then marks an unread notification as read. mark-read, mark-unread, pin
and unpin report each change ("Pinned notification 12
(alice/project#17)"), and --all confirms on a terminal and reports the
count. notification watch --json printed one array when it exited; it
now prints each change as one JSON object per line, prints a line per
change on a terminal, and runs until Ctrl-C there instead of stopping
after a minute.

Status and type filters complete and validate their values, notification
IDs complete from the inbox, and every command has examples.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/app_test.go

@@ -415,8 +415,6 @@ func walkCommands(cmd *cobra.Command, visit func(*cobra.Command)) {
 // have yet to complete; see TestHelpTextsAreComplete.
 const (
 	shortsToFix = `
-	notification mark-read
-	notification mark-unread
 	pr review cancel-request
 `
 	examplesToWrite = `
@@ -459,13 +457,6 @@ const (
 	milestone list
 	milestone reopen
 	milestone view
-	notification list
-	notification mark-read
-	notification mark-unread
-	notification pin
-	notification unpin
-	notification view
-	notification watch
 	pr attachment delete
 	pr attachment download
 	pr attachment edit
@@ -547,7 +538,6 @@ const (
 	label
 	milestone
 	milestone issue
-	notification
 	pr
 	pr attachment
 	pr comment