feat: add Sketchybar integration example

examples/sketchybar/README.md

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+# Sketchybar Integration
+
+Display pomodoro status in [sketchybar](https://github.com/FelixKratz/SketchyBar).
+
+## Setup
+
+1. Copy the plugin to your sketchybar plugins directory:
+
+   ```bash
+   cp plugins/pomodoro.sh ~/.config/sketchybar/plugins/
+   chmod +x ~/.config/sketchybar/plugins/pomodoro.sh
+   ```
+
+2. Update the `POMODORO` path in `pomodoro.sh` to match your installation.
+
+3. Add the snippet from `sketchybarrc` to your sketchybar configuration.
+
+4. Reload sketchybar:
+
+   ```bash
+   sketchybar --reload
+   ```

examples/sketchybar/plugins/pomodoro.sh

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+#!/bin/sh
+
+POMODORO="$HOME/go/bin/pomodoro"
+STATUS=$($POMODORO status 2>/dev/null)
+
+if [ -z "$STATUS" ]; then
+  sketchybar --set "$NAME" \
+    icon="󰔟" \
+    label="00:00" \
+    icon.color=0xff9a67ea
+else
+  REMAINING=$($POMODORO status -f "%r" 2>/dev/null)
+
+  if [ "$REMAINING" = "0:00" ]; then
+    sketchybar --set "$NAME" \
+      icon="󰾫" \
+      label="Done" \
+      icon.color=0xff9a67ea
+  else
+    sketchybar --set "$NAME" \
+      icon="󱎫" \
+      label="$REMAINING" \
+      icon.color=0xffff6961
+  fi
+fi

examples/sketchybar/sketchybarrc

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+PLUGIN_DIR="$CONFIG_DIR/plugins"
+
+sketchybar --add item pomodoro left \
+           --set pomodoro update_freq=1 icon="󰔟" script="$PLUGIN_DIR/pomodoro.sh" label.padding_right=10 icon.padding_left=10 icon.font.size=22
+
+sketchybar --add bracket pomodoro \
+           --set pomodoro background.color=0xff000000 \
+                          background.height=30 \
+                          background.corner_radius=10