Tidy up after the sizing rework
The caps model landed in pieces, and the pieces left seams. This joins them up, and fixes two things the reread turned up. Deferred subsurface syncing is gone. `needs_tiles` existed because `select` had no queue handle to sync with, so main.rs grew a bespoke event loop to notice the flag afterwards. The dispatch handlers are handed a handle already: pass it down and let `select` do the work itself. main.rs is back to one uniform `pump`. The layout is built once, in run(), and passed to App::new, rather than built there and again inside it. `display` moves from Settings, which is what App needs, to Options, which is what the caller needs it for. `timeout = 0` meant an immediate deadline, so uncommenting the line in the shipped config would have made wl-pick exit before you saw it. Zero now means no timeout, which is what the comment beside it always claimed. `timeout` was also settable but documented nowhere -- not in --help, not in the README. Both now list every key config.rs accepts. Theme::default's max-width/max-height were placeholder pixel counts that happened to match one monitor. They are i32::MAX now: no cap of their own, with Layout clamping to the display.
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Milad Alizadeh