Redesign the titlebar right-click menu: real separators/headers, live customization

Reported live: "looks very ugly currently and some of it doesn't make
sense." Both were real. Every row, including a bare divider, took one
full TITLEBAR_HEIGHT slot, so a separator was a 1px hairline in the
middle of 32px of empty space; "Move to Workspace" faked a section
caption by embedding box-drawing characters directly in an ordinary
item's label, which rendered - and behaved, until the click-dispatch
site's own special case - exactly like a clickable row that did
nothing. Separately, "Floating" was always offered even though
Window::floating only affects the "tiling" layout: toggling it under
this project's own default "dynamic" layout visibly changes nothing,
reading as a broken control rather than an inapplicable one.

ContextMenu (crates/core/src/context_menu.rs) gained real Separator
(9px) and Header (22px, non-interactive, dimmed) row kinds with their
own small heights, replacing the label-hack outright. Both backends'
rendering now sum each row's own real height instead of assuming one
uniform value, so hit-testing and pixels can't disagree about where a
row is. Floating is omitted entirely outside the tiling layout.

New, in direct response to "allow customizing from there as well": a
Customize section with live Button Style / Button Side toggles. Each
flips the matching ThemeConfig field and immediately redraws every open
window's titlebar - not routed through srd set's own path, which is
scoped to windows created after the call for lack of a redraw hook it
can reach; a menu action that didn't visibly change the titlebar you
clicked would be its own "doesn't make sense" bug.

Full workspace build/test/clippy clean (242 core tests, +8; 152
wayland, net-even after rewriting the old label-hack tests).

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