Make tiling's master/stack ratio live, add settings readback everywhere

Investigated the "tiling needs a lot of work" report directly. The
MasterStackLayout algorithm itself was already correct; the real gap was
that dragging or resizing a tiled window did nothing durable (raw
geometry that the next arrange_workspace silently discarded), and
master_ratio/master_count had no live path at all (config-file only).

A resize-drag on the shared master/stack boundary now live-adjusts
TilingConfig::master_ratio and re-arranges the group immediately; srd set
master_ratio/master_count do the same for a keybind or script. Found and
fixed a real bug while building this: start_resize's own focus_window
call re-stacks its target in self.order before the ratio-drag decision
used to be made, silently misclassifying real master-column grabs.
Fixed by deciding ratio-drag status (and freezing the membership
snapshot it depends on) before that raise happens, applying
MasterStackLayout directly against the frozen snapshot rather than
re-deriving membership from the by-then-reordered live order. Live-
verified in a nested compositor, not just unit-tested.

Also closes the readback gaps flagged directly by the AGS peer session:
border_width/border_color/corner_radius/decoration_mode/gap_inner/
gap_outer/master_ratio/master_count were all live-settable via srd set
with no way to read the current value back, and pin_input had no
readback at all. SettingsResponse now reports all of them; a new
pinned_inputs query (srd pinned inputs) lists every currently pinned
pid/window.

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