feat: improve --centered flag behavior for set-floating and toggle-floating

[DreamMaoMao]

  - commands: ['toggle-floating --centered']
    bindings: ['alt+\']

if use --centered option in toggle-flating. it will be set position of the flaoting window to centered at first time.

2024-11-09.12-10-39.mp4

[lars-berger]

Hey @DreamMaoMao - I hope you don't mind but did a couple of tweaks: 1) check has_custom_floating_placement for set-floating so that it's consistent with toggle-floating 2) remove has_custom_floating_placement from the DTO (this gets emitted via our public IPC interface, and I think it's probs best if we just use it internally).

Thanks for the huge help on this🙏 Will go ahead and merge!

[github-actions]

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