Follow Plasma's virtual keyboard setting

KWin activates the input method for every text field; its policy (the
tray toggle) only gates the input panel, which sloposk doesn't use. sloposk
now asks KWin over D-Bus whether a focused field should show the
keyboard: never when off, only after touch or a pen by default.
"Always Show" and D-Bus Show/Toggle still show it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -13,6 +13,7 @@ iPad-style floating on-screen keyboard for Plasma Wayland. Qt 6, C++ core, QML U
 - Ctrl/Alt/Super stick like shift (tap, double-tap, hold) and turn keys into shortcuts; a tapped or held shift joins them (Shift+F5, Shift+Tab, Shift+arrows), auto-shift and caps lock don't
 - Optional PC key blocks: function row, navigation (ins/home/pg up, del/end/pg dn, arrows), numeric keypad; any mix, typing keys included (⚙)
 - Floating: drag the bottom bar, resize from the corner; geometry is remembered per screen
+- Follows Plasma's virtual keyboard setting (tray toggle): off never pops up on focus, the default only after touch or a pen; "Always Show" and D-Bus `Show`/`Toggle` still show it
 - See-through background (opacity slider in ⚙) with optional blur behind it (KWin's blur effect)
 
 ## Build & test