This is a tracking issue for a bunch of small changes I'm proposing to make, to clear up a few confusing things in our UI.

(For example, we should prevent the kind of confusion experienced by this user:

I'd like to add that is impossible to unmerge less than 2 issues

who was interpreting the fact that we list the issue itself under "Merged Issues" to mean that there was a separate issue of the same title which had been merged in.)

Tasks:

• Change heading on merged issues tab to Fingerprints included in this issue (done in fix(merging): Clarify Merged Issues tab header text #57903)
• Disable Merged Issues tab if the issue only has one associated hash?
• Adjust sub-header copy to make it clear all "unmerged" issues' events land in a single new event (done in ref(merging): Improve explanations on Merged Issues tab #58210)
• Adjust sub-header copy to more directly account for possible delays in data consistency (done in ref(merging): Include 24-hr wait time in disclaimer on Merged Issues tab #57947)
• Not show checkbox next to hash and not show count in the button if there's only one hash listed
• Adjust tooltips/error messages to better explain why certain actions are disallowed (done in ref(merging): Improve explanations on Merged Issues tab #58210)
• Fix the fact that events without a culprit don't show a title in the merged issues tab
• Fix the fact that it's not obvious the latest-event links are even links