feat: implement notification color swatch and dependency verification

tests/run_tests.sh

@@ -206,6 +206,32 @@ it "rejects invalid formats"
 output=$("$COLOR_TOOL" "#000000" --output badfmt --no-copy --no-notify 2>&1 || true)
 assert_contains "$output" "Error: Invalid output format: badfmt"
 
+# 14. Installation Dependency Warnings
+it "warns about missing dependencies during install"
+mkdir -p "$TEST_DIR/install_bin"
+for cmd in bash cat echo printf mkdir mktemp chmod rm cp ln dirname readlink ps; do
+  if [[ -e "/usr/bin/$cmd" || -L "/usr/bin/$cmd" ]]; then
+    /usr/bin/ln -s "/usr/bin/$cmd" "$TEST_DIR/install_bin/$cmd"
+  elif [[ -e "/bin/$cmd" || -L "/bin/$cmd" ]]; then
+    /usr/bin/ln -s "/bin/$cmd" "$TEST_DIR/install_bin/$cmd"
+  fi
+done
+output=$(PATH="$TEST_DIR/install_bin" HOME="$TEST_DIR" WAYLAND_DISPLAY="" XDG_CURRENT_DESKTOP="" KDE_FULL_SESSION="" "$COLOR_TOOL" --install 2>&1 || true)
+
+if [[ "$output" == *"python3 — required"* ]] &&
+   [[ "$output" == *"jq — required"* ]] &&
+   [[ "$output" == *"curl — required"* ]] &&
+   [[ "$output" == *"libnotify (notify-send)"* ]] &&
+   [[ "$output" == *"KDE Plasma on Wayland"* ]] &&
+   [[ "$output" == *"ImageMagick"* ]] &&
+   [[ "$output" == *"wl-clipboard"* ]]; then
+  echo "PASS"
+  passed=$((passed + 1))
+else
+  echo "FAIL"
+  echo "  Actual output: $output"
+fi
+
 # ── Cleanup ───────────────────────────────────────────────────────────────────
 echo "---------------------------------------"
 echo "Result: $passed/$total tests passed."