chore: clean up dotfiles and add gitignore whitelist

Switch to whitelist-based .gitignore to only track essential configs:
nvim, yazi, kitty, zsh, ideavim, karabiner, tmux, scripts, starship.
Remove history, compiled files, and plugin dirs from tracking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/stop-kanata.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Kanata Stop Script
+# Stops Kanata process gracefully
+
+LOG_FILE="$HOME/Library/Logs/kanata.log"
+PID_FILE="$HOME/.kanata.pid"
+
+# Check if PID file exists
+if [ -f "$PID_FILE" ]; then
+    KANATA_PID=$(cat "$PID_FILE")
+    
+    # Check if process is running
+    if ps -p "$KANATA_PID" > /dev/null 2>&1; then
+        echo "$(date): Stopping Kanata (PID: $KANATA_PID)" >> "$LOG_FILE"
+        sudo kill "$KANATA_PID"
+        rm -f "$PID_FILE"
+        echo "$(date): Kanata stopped" >> "$LOG_FILE"
+    else
+        echo "$(date): Kanata process not found (PID: $KANATA_PID)" >> "$LOG_FILE"
+        rm -f "$PID_FILE"
+    fi
+else
+    # Try to kill any running kanata process
+    if pgrep -x "kanata" > /dev/null; then
+        echo "$(date): Killing all Kanata processes" >> "$LOG_FILE"
+        sudo pkill kanata
+        echo "$(date): Kanata processes killed" >> "$LOG_FILE"
+    else
+        echo "$(date): No Kanata processes found" >> "$LOG_FILE"
+    fi
+fi