fix: fastfetch logo stretching and centering, slideshow COSMIC update

- Remove explicit width/height from fastfetch logo config so kitty auto-sizes without stretching
- Remove stray keyWidth:20 from first section footer that shifted bottom border right
- Add 4 dashes to first footer to match header width (71 chars each)
- Update slideshow COSMIC text and welcome app copy

packages/antergos-layan-theme/Configs/Home/.config/fastfetch/config.jsonc

@@ -3,8 +3,6 @@
     "logo": {
         "source": "~/.config/fastfetch/AntergosP.png",
         "type": "kitty",
-        "height": 18,
-        "width": 25,
         "padding": {
             "top": 8,
             "left": 3
@@ -24,8 +22,7 @@
         },
         {
           "type": "custom",
-          "format": "\u001b[36m└─────────────────────────────────────────────────────────────────┘",
-          "keyWidth": 20
+          "format": "\u001b[36m└─────────────────────────────────────────────────────────────────────┘"
             },
             "break",
             {