What does this PR do?
Adds the filters "show boosts" and "only notes with files" to channel and list timelines, in both classic and deck UI.
Note: the "list" part was already half-done! MkTimeline and the backend already supported these filters.
As noted on issue #228 (closed), doing this to role and antenna timelines requires a bigger rework of those backends, we may do it once upstream aligns them with the rest.
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