chore: replace box-drawing CF banner with pixel-rendered logo mark

Uses chafa + PIL to threshold the favicon SVG to a clean 20x10 block
character grid, giving the actual CF logo shape (angular diamond/bracket
pattern from the SVG) rather than hand-drawn box chars. Logo renders in
${grn} with wordmark and subtitle to the right on select lines.

install.sh

@@ -134,11 +134,16 @@ fi
 
 script-title() {
     format_boxborder --center --box-type=double \
-    "${grn}  ╔═══╗  ╔═══╗  ${dfl}" \
-    "${grn}  ║      ╠═══╝  ${dfl}   ${bld}C I R C U I T F O R G E${dfl}" \
-    "${grn}  ║      ╠      ${dfl}   ${lyl}Node Bootstrap Installer${dfl}" \
-    "${grn}  ║      ║      ${dfl}" \
-    "${grn}  ╚═══╝  ╚      ${dfl}   ${gry}v${VERSION}${dfl}"
+    "${grn}        ████        ${dfl}" \
+    "${grn}      ████████      ${dfl}${bld}  C I R C U I T  F O R G E  ${dfl}" \
+    "${grn}    ████    ████    ${dfl}" \
+    "${grn} ██████████████████ ${dfl}${gry}  ─────────────────────────  ${dfl}" \
+    "${grn}███  ██   ████   ███${dfl}${lyl}  Node Bootstrap Installer   ${dfl}" \
+    "${grn}████████████   █████${dfl}" \
+    "${grn}████████    ████████${dfl}${gry}  v${VERSION}                        ${dfl}" \
+    "${grn} ██████████████████ ${dfl}" \
+    "${grn}    ████████████    ${dfl}" \
+    "${grn}      ████████      ${dfl}"
 }
 
 # Function for displaying the usage of this script