Make package removal match exact installed names only

pacman -Q resolves provider names, so dropping a virtual package could
remove whichever package provides it. Read pacman -Qq once and match
requested names exactly, ignoring providers and duplicate arguments.
Ports the provider-ignoring semantics of 9791b227 from master with a
single pacman query instead of one per package.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/shell.d/pkg-drop-test.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+test_tmp=$(mktemp -d)
+trap 'rm -rf "$test_tmp"' EXIT
+
+mock_path="$test_tmp/pkg-drop-bin"
+mkdir -p "$mock_path"
+
+cat >"$mock_path/pacman" <<'EOF'
+#!/bin/bash
+if [[ $1 == "-Qq" ]]; then
+  printf '%s\n' exact-package provider-package
+fi
+EOF
+
+cat >"$mock_path/sudo" <<'EOF'
+#!/bin/bash
+printf '%s\n' "$*" >"$TEST_TMP/pkg-drop-command"
+EOF
+
+chmod +x "$mock_path/pacman" "$mock_path/sudo"
+
+PATH="$mock_path:$PATH" TEST_TMP="$test_tmp" \
+  "$ROOT/bin/omarchy-pkg-drop" exact-package virtual-package provider-package exact-package
+
+[[ $(<"$test_tmp/pkg-drop-command") == "pacman -Rns --noconfirm exact-package provider-package" ]] ||
+  fail "package removal targets exact installed names only"
+pass "package removal ignores providers and duplicate arguments"