Sieve filters: Readable summary for actions and conditions

Follow up to https://github.com/nextcloud/mail/issues/10655

Concept 1 (Nimisha, 2025-02-04):

Initial state	While filling	After filling

To make it easier to read, if a condition or action is not being edited, it can be shown in a readable summary like "Subject matches *planning". An edit button on the side replaces the summary with the dropdowns for editing.

Concept 2 (Laura, 2025-05-16):

Initial state	While filling	After filling

There is no explicit "Edit" action. Instead, conditions collapse into a single-line "entry". Clicking this expands them to their full editable size. Actions stay the same. This saves space the same, but reduces the shifting around of the layout and elements.

To discuss:

• Is the current version, without editing state, good enough or should we schedule a follow up?
• Conditions (e.g. Sender is exactly) might be a list. Could design provide another mockup for the editing state with a list?

Review the current Sieve filter condition and action UI alongside the two concepts and attached mockups. First resolve which interaction and list behavior should be implemented; done means the chosen readable-summary or collapsed-entry design is implemented consistently for conditions and actions.