Type into any window: fake input when no text field is focused

- KWinFakeInput (org_kde_kwin_fake_input v6, offered by KWin to the
  input-method process): keysyms with real modifier keys held
- The KWin backend uses the input method in text fields and fake input
  everywhere else, so shortcuts, terminals and the desktop get keys
- Text rules (auto-capitalization, double-space) only apply in fields
- Always Show setting keeps the keyboard up without a text field

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

README.md

@@ -4,6 +4,7 @@ iPad-style floating on-screen keyboard for Plasma Wayland. Qt 6, C++ core, QML U
 
 - Flick a key down for its secondary symbol; long-press for accented alternates
 - iOS shift: tap = one letter, double-tap = caps lock, hold = shift while held
+- Works everywhere, not just in text fields: with none focused, keys reach the focused window like a hardware keyboard (shortcuts, terminals, the desktop); "Always Show" in ⚙ keeps it up
 - 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
@@ -60,7 +61,7 @@ Everything else is `layouts/template.json`; `~/.local/share/sloposk/template.jso
 
 ## Settings
 
-`~/.config/sloposk/sloposk.conf`, also editable from the ⚙ panel: `typing/autoCapitalize`, `typing/doubleSpacePeriod`, `layout/visibleSections` (`main` plus section ids), `layout/fullKeyboard`.
+`~/.config/sloposk/sloposk.conf`, also editable from the ⚙ panel: `typing/autoCapitalize`, `typing/doubleSpacePeriod`, `layout/visibleSections` (`main` plus section ids), `layout/fullKeyboard`, `window/alwaysVisible`.
 
 ## Architecture
 
@@ -68,7 +69,7 @@ Everything else is `layouts/template.json`; `~/.local/share/sloposk/template.jso
 qml/        view only
 input/      touch → PointerTracker gestures → KeyboardController rules
 engine/     key output → text ops (DirectEngine; prediction/swipe later)
-backend/    text ops → compositor (KWin input-method-v1); the compositor's keymap
+backend/    text ops → compositor (KWin input-method-v1, or fake input with no text field); the compositor's keymap
 layout/     template JSON + keymap letters → Layout → LayoutModel (geometry, hit testing)
 window/     floating layer-shell placement, visibility, saved geometry
 app/        D-Bus control and system layouts, dev hooks
@@ -76,3 +77,5 @@ settings/   persisted user preferences
 ```
 
 `sloposk_core` (everything compositor-independent, plus the `Sloposk` QML module) is a static library shared by the app and the tests.
+
+`protocols/fake-input.xml` is KDE's `org_kde_kwin_fake_input` (LGPL-2.1-or-later), vendored from plasma-wayland-protocols.