ipc wallpaper handler, fix high CPU usage

scripts/README-dynamic-theme.md

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+# Dynamic Theme Setup
+
+This setup adds wallpaper-aware "Auto" theme support to your Quickshell + Niri environment.
+
+## Prerequisites
+
+Install the required tools:
+
+```bash
+# Required for Material-You palette generation
+# Or paru -S matugen-bin on arch
+cargo install matugen
+
+# Required for JSON processing (usually pre-installed)
+sudo pacman -S jq  # Arch Linux
+# or: sudo apt install jq  # Ubuntu/Debian
+
+# Background setters (choose one)
+sudo pacman -S swaybg  # Simple and reliable
+```
+
+## Setup
+
+1. **Initial wallpaper setup:**
+   ```bash
+   # Set your initial wallpaper
+   sudo cp ./set-wallpaper.sh /usr/local/bin
+   sudo chmod +x /usr/local/bin/set-wallpaper.sh
+   set-wallpaper.sh /path/to/your/wallpaper.jpg
+   ```
+
+2. **Enable Niri color integration (optional):**
+   Niri doesn't have a good way to just set colors, you have to edit your main `~/.config/niri/config.kdl`
+
+   The script generates suggestions in `~/quickshell/generated_niri_colors.kdl` you can manually configure in Niri.
+
+3. **Enable Auto theme:**
+   Open Control Center → Theme Picker → Click the gradient "Auto" button
+
+4. **Configure swaybg systemd unit**
+
+```
+[Unit]
+PartOf=graphical-session.target
+After=graphical-session.target
+Requisite=graphical-session.target
+
+[Service]
+ExecStart=/usr/bin/swaybg -m fill -i "%h/quickshell/current_wallpaper"
+Restart=on-failure
+```
+
+```bash
+systemctl enable --user --now swaybg
+```

scripts/set-wallpaper.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+img=$1
+# Convert to absolute path to fix symlink issues
+img=$(realpath "$img")
+
+QS_DIR="$HOME/quickshell"
+mkdir -p "$QS_DIR"
+LINK="$QS_DIR/current_wallpaper"
+
+ln -sf -- "$img" "$LINK"
+
+# Kill existing swaybg processes before starting new one
+pkill -f "swaybg.*$LINK" 2>/dev/null || true
+swaybg -m fill -i "$LINK" & disown
+
+json="$(matugen image "$img" --json hex)"
+get() { jq -r "$1" <<<"$json"; }
+
+bg=$(get '.colors.dark.background')
+fg=$(get '.colors.dark.on_background')
+primary=$(get '.colors.dark.primary')
+secondary=$(get '.colors.dark.secondary')
+tertiary=$(get '.colors.dark.tertiary')
+tertiary_ctr=$(get '.colors.dark.tertiary_container')
+error=$(get '.colors.dark.error')
+inverse=$(get '.colors.dark.inverse_primary')
+
+bg_b=$(get '.colors.light.background')
+fg_b=$(get '.colors.light.on_background')
+primary_b=$(get '.colors.light.primary')
+secondary_b=$(get '.colors.light.secondary')
+tertiary_b=$(get '.colors.light.tertiary')
+tertiary_ctr_b=$(get '.colors.light.tertiary_container')
+error_b=$(get '.colors.light.error')
+inverse_b=$(get '.colors.light.inverse_primary')
+
+cat >"$QS_DIR/generated_niri_colors.kdl" <<EOF
+// AUTO-GENERATED on $(date)
+layout {
+    border {
+        active-color   "$primary"
+        inactive-color "$secondary"
+    }
+    focus-ring {
+        active-color   "$inverse"
+    }
+    background-color "$bg"
+}
+EOF
+
+echo "→ Niri colours:   $QS_DIR/generated_niri_colors.kdl"
+
+cat >"$QS_DIR/generated_ghostty_colors.conf" <<EOF
+# AUTO-GENERATED on $(date)
+background = $bg
+foreground = $fg
+cursor-color = $inverse
+selection-background = $secondary
+selection-foreground = #ffffff
+palette = 0=$bg
+palette = 1=$error
+palette = 2=$tertiary
+palette = 3=$secondary
+palette = 4=$primary
+palette = 5=$tertiary_ctr
+palette = 6=$inverse
+palette = 7=$fg
+palette = 8=$bg_b
+palette = 9=$error_b
+palette = 10=$tertiary_b
+palette = 11=$secondary_b
+palette = 12=$primary_b
+palette = 13=$tertiary_ctr_b
+palette = 14=$inverse_b
+palette = 15=$fg_b
+EOF
+
+echo "→ Ghostty theme:  $QS_DIR/generated_ghostty_colors.conf"
+echo "   (use in ghostty:  theme = $QS_DIR/generated_ghostty_colors.conf )"
+
+niri msg action do-screen-transition --delay-ms 100
+
+# Notify running shell about wallpaper change via IPC
+qs -c "DankMaterialShell" ipc call wallpaper refresh 2>/dev/null && echo "→ Shell notified via IPC" || echo "→ Shell not running or IPC failed"