Phase 7: rename SkyOS → OrionOS across entire codebase

- Rename all binaries: skywm→orionwm, skydeskbar→oriondeskbar,
  skylauncher→orionlauncher, skyinstall/skyinstall-gui→orioninstall*
- Rename theme directory: themes/SkyOS/ → themes/OrionOS/
- Update all string literals, window titles, menu labels, and comments
- Update ISO build: hostname→orionos, user→orion, all paths/labels
- Add Plymouth boot splash theme (orionos) with Navy+Blue palette
- Update GTK2/GTK3 theme names, wallpaper output name
- Update .gitignore, root Makefile, build-iso.sh for new binary names

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

wm/Makefile

@@ -16,7 +16,7 @@ LDFLAGS = $(PKG_XFT_L)
 
 SRC = src/wm.c src/client.c src/events.c src/draw.c src/color.c src/menu.c src/switcher.c
 OBJ = $(SRC:.c=.o)
-BIN = skywm
+BIN = orionwm
 
 .PHONY: all clean install
 all: $(BIN)

wm/src/menu.c

@@ -5,7 +5,7 @@
 #define MENU_PADDING   5
 
 static const MenuItem MENU_ITEMS[] = {
-    { "App Launcher",      "skylauncher &"                              },
+    { "App Launcher",      "orionlauncher &"                              },
     { "Terminal",          "alacritty &"                                },
     { "File Manager",      "thunar &"                                   },
     { "Text Editor",       "mousepad &"                                 },
@@ -17,8 +17,8 @@ static const MenuItem MENU_ITEMS[] = {
     { "──────────────────", NULL                                         },
     { "Change Wallpaper",  "skywallpaper --reset &"                     },
     { "──────────────────", NULL                                         },
-    { "Restart SkyWM",     "pkill skywm; sleep 0.2; skywm &"           },
-    { "Quit SkyOS",        "pkill skywm"                                },
+    { "Restart OrionWM",     "pkill skywm; sleep 0.2; skywm &"           },
+    { "Quit OrionOS",        "pkill skywm"                                },
 };
 #define MENU_COUNT  ((int)(sizeof(MENU_ITEMS) / sizeof(MENU_ITEMS[0])))
 

wm/src/wm.c

@@ -5,19 +5,19 @@ static int x_error_handler(Display *dpy, XErrorEvent *e) {
         return 0;
     char buf[256];
     XGetErrorText(dpy, e->error_code, buf, sizeof(buf));
-    fprintf(stderr, "skywm: X error: %s (request %d)\n", buf, e->request_code);
+    fprintf(stderr, "orionwm: X error: %s (request %d)\n", buf, e->request_code);
     return 0;
 }
 
 static int x_error_start(Display *dpy, XErrorEvent *e) {
     (void)dpy; (void)e;
-    fprintf(stderr, "skywm: another window manager is already running\n");
+    fprintf(stderr, "orionwm: another window manager is already running\n");
     exit(1);
 }
 
 void wm_init(WM *wm) {
     wm->dpy = XOpenDisplay(NULL);
-    if (!wm->dpy) { fprintf(stderr, "skywm: cannot open display\n"); exit(1); }
+    if (!wm->dpy) { fprintf(stderr, "orionwm: cannot open display\n"); exit(1); }
 
     wm->screen = DefaultScreen(wm->dpy);
     wm->root   = RootWindow(wm->dpy, wm->screen);
@@ -121,7 +121,7 @@ void wm_init(WM *wm) {
     if (children) XFree(children);
 
     XSync(wm->dpy, False);
-    fprintf(stderr, "skywm: started\n");
+    fprintf(stderr, "orionwm: started\n");
 }
 
 void wm_run(WM *wm) {