Add Postpone-like context menu to the Date Emojis (Start, Scheduled, Due and likely others too) to allow easy changing of individual fields

[claremacrae]

⚠️ Please check that this feature request hasn't been suggested before.

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🔖 Feature description

There has been a lot of back-and-forth about alternative behaviours for the Postpone button and its context menu.

This is to capture an idea first written down in #2452:

Add right-click menu on each of the date emojis (including created and done) - to edit specific fields

Initially this will be enabled in the Tasks query results view.

It may end up appearing in Reading mode too, for free.

✔️ Solution

Use the patterns of code in these two directories to generalise the code for the Postpone context menu, and apply it for each of the date emojis.

• src/ui/EditInstructions/
• src/ui/Menus/

❓ Alternatives

No response

📝 Additional Context

I have actually tried to do this several times already, trying to refactor the Postpone code for re-use, and not succeeded, because of the complexity of the call-backs in that code.