Write down what installing on Fedora takes

The README has Arch and Ubuntu on it, and the two things that differ on Fedora
are the two that decide whether anything works at all. The package names are
its own, and `systemctl --user enable --now ydotool` has nothing to enable
there: Fedora ships ydotool as a system service only, and its ydotoold holds a
root-owned socket at mode 600. The unit is green, the daemon is up, and every
paste is refused. The drop-in the README now spells out points ydotoold at
$XDG_RUNTIME_DIR/.ydotool_socket and hands it over by uid, which is the path
the client already looks at, so nothing has to carry YDOTOOL_SOCKET. Red Hat
closed the same report as NOTABUG in 2023, so this stays a step the user takes
rather than one a later package will take for them.

install.sh was asking whether the unit was up, which is the question that
answers wrongly here. It now asks whether the socket is one this user may write
to, which is what auto-paste actually needs, and it names which of the three
ways it failed: a socket handed to nobody, a daemon that put its socket
somewhere else, or no daemon at all. On Arch and everywhere else the answer is
the same one as before.

ffmpeg-free out of Fedora's own repositories is enough, against the usual
advice to reach for RPM Fusion. That build disables four video decoders, h264,
hevc, vc1 and vvc, and keeps every audio decoder it has, AAC among them, while
Dikte only ever asks a video file for its audio track.

The models that run on this machine ask for nothing either, which is worth
saying because it is now the way Dikte starts. The Ubuntu builds run on Fedora
unchanged; whisper.cpp transcribed a clip here without a package being added,
and llama.cpp came down in its Vulkan build and found the card. That last part
is not luck: kwin-libs requires libvulkan.so.1, so the loader is on every
Plasma desktop by way of the compositor, and it recommends the Mesa drivers
alongside itself.

install.sh

@@ -40,21 +40,38 @@ python3 -c 'import PyQt6.QtWidgets' 2>/dev/null || missing+=("python-pyqt6")
 
 if ((${#missing[@]})); then
   warn "Missing: ${missing[*]}"
-  say  "Ubuntu X11:    sudo apt install pulseaudio-utils xclip xdotool ffmpeg"
-  say  "Arch Wayland:  sudo pacman -S --needed pipewire-audio wl-clipboard ydotool ffmpeg python-pyqt6"
+  say  "Ubuntu X11:     sudo apt install pulseaudio-utils xclip xdotool ffmpeg"
+  say  "Arch Wayland:   sudo pacman -S --needed pipewire-audio wl-clipboard ydotool ffmpeg python-pyqt6"
+  say  "Fedora Wayland: sudo dnf install pipewire-utils wl-clipboard ydotool ffmpeg-free python3-pyqt6"
   echo
 else
   ok "All dependencies present"
 fi
 
 # 2. ydotoold --------------------------------------------------------------
+# What auto-paste needs is a socket it may write to, which is not the same
+# question as whether the unit is up: Fedora ships ydotool as a system service
+# only, and its socket stays root-owned at mode 600, so there the daemon can be
+# running while every paste is refused.
 if [[ "${XDG_SESSION_TYPE:-}" != "x11" ]] && command -v ydotool >/dev/null; then
-  if systemctl --user is-active --quiet ydotool 2>/dev/null \
-     || systemctl --user is-active --quiet ydotoold 2>/dev/null; then
+  socket="${YDOTOOL_SOCKET:-${XDG_RUNTIME_DIR:-/tmp}/.ydotool_socket}"
+  if [[ -w "$socket" ]]; then
     ok "ydotoold is running (auto-paste ready)"
+  elif systemctl is-active --quiet ydotool 2>/dev/null; then
+    warn "ydotoold runs as a system service, whose socket is not yours to"
+    say  "write to. Hand it over in /etc/systemd/system/ydotool.service.d/"
+    say  "override.conf, which is what the README's Fedora section does:"
+    say  "  [Service]"
+    say  "  ExecStart="
+    say  "  ExecStart=/usr/bin/ydotoold --socket-path=$socket --socket-own=$(id -u):$(id -g)"
+    say  "then sudo systemctl daemon-reload && sudo systemctl restart ydotool"
+  elif systemctl --user is-active --quiet ydotool 2>/dev/null \
+       || systemctl --user is-active --quiet ydotoold 2>/dev/null; then
+    warn "ydotoold is running, but it did not put its socket at $socket"
+    say  "Point Dikte at the one it did make: export YDOTOOL_SOCKET=..."
   else
     warn "ydotoold is not running, auto-paste will not work"
-    say  "systemctl --user enable --now ydotool"
+    say  "systemctl --user enable --now ydotool   (on Fedora: see the README)"
   fi
 fi