Slide sideways on space to move the cursor

As on phone keyboards: a sideways move on space moves the cursor right
away, along the line only, without blanking the keys. Long-press space
still opens the full trackpad.

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

README.md

@@ -8,7 +8,7 @@ iPad-style floating on-screen keyboard for Plasma Wayland. Qt 6, C++ core, QML U
 - "Hold Keys" (⚙): keys stay down while touched, like a hardware keyboard (games, Shift+click, system key repeat); modifiers are plain keys, dead keys compose in the app; touch conveniences off
 - Letters follow the system keyboard layout; the globe key switches it
 - Auto-capitalization, double-space → ". " (both optional, ⚙ on the bottom bar), backspace repeat → word delete
-- Long-press space = trackpad; slide from `.?123` onto a symbol and release
+- Slide sideways on space to move the cursor; long-press space = trackpad (lines too); slide from `.?123` onto a symbol and release
 - Compact (iPad) or full (iPad Pro) keyboard: number row, punctuation, tab, caps lock, ctrl/alt/super, dead keys
 - 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 (⚙)