Rewrite orionpkg into full GUI package manager

Previously only an update manager. Now has three tabs:
- Search: pacman -Ss query, shows results with installed badge, Install button
- Installed: pacman -Q list with scrollable rows, Remove button
- Updates: checkupdates list, Update All runs pkexec pacman -Syu

Features:
- Editable search input field with cursor, Enter to search
- Row selection with highlight, double-click toggles
- Scrollable package lists with scrollbar
- Live log view + progress bar during install/remove/upgrade
- Spinner animation during async operations
- Cancel button during running operations
- Error/success status display
- Same dark-navy palette as rest of OrionOS

orionpkg/Makefile

@@ -1,15 +1,22 @@
+CC = gcc
+
+PKG_C := $(shell pkg-config --cflags x11 xft 2>/dev/null)
+PKG_L := $(shell pkg-config --libs   x11 xft 2>/dev/null)
+
+ifeq ($(PKG_C),)
+  $(error "Required: libx11-dev libxft-dev")
+endif
+
+CFLAGS  = -Wall -Wextra -O2 $(PKG_C)
+LDFLAGS = $(PKG_L)
+
 BIN = orionpkg
 
-CC     = gcc
+.PHONY: all clean install
-CFLAGS = -Wall -Wextra -O2 \
+all: $(BIN)
-          $(shell pkg-config --cflags x11 xft fontconfig 2>/dev/null)
-LIBS   = $(shell pkg-config --libs   x11 xft fontconfig 2>/dev/null) \
-          -lX11 -lXft -lfontconfig
-
 $(BIN): orionpkg.c
-	$(CC) $(CFLAGS) -o $@ $< $(LIBS)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
-
+install: $(BIN)
+	install -Dm755 $(BIN) /usr/local/bin/$(BIN)
 clean:
 	rm -f $(BIN)
-
-.PHONY: clean