Remove crosshair-only grid mode, keep grid on/off toggle

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/osc.nim

@@ -68,10 +68,7 @@ proc main() =
     of Key.Space:
       scope.frozen = not scope.frozen
     of Key.G:
-      scope.grid = case scope.grid
-        of gsGrid: gsCross
-        of gsCross: gsOff
-        of gsOff: gsGrid
+      scope.grid = if scope.grid == gsGrid: gsOff else: gsGrid
     else:
       discard
 

src/osc/scope.nim

@@ -10,7 +10,6 @@ type
 
   GridStyle* = enum
     gsGrid     ## Full graticule
-    gsCross    ## Center crosshair only
     gsOff      ## No grid
 
   Scope* = object
@@ -93,33 +92,31 @@ proc drawGraticule*(tb: var TerminalBuffer, w, h: int, grid: GridStyle) =
   let cx = w div 2
   let cy = h div 2
 
-  if grid == gsGrid:
-    # Division lines
-    for d in 1..<10:
-      let x = d * w div 10
-      if x > 0 and x < w:
-        for y in 0..<h:
-          tb.write(x, y, fgGreen, styleDim, "│")
-    for d in 1..<8:
-      let y = d * h div 8
-      if y > 0 and y < h:
-        for x in 0..<w:
-          tb.write(x, y, fgGreen, styleDim, "─")
+  # Division lines
+  for d in 1..<10:
+    let x = d * w div 10
+    if x > 0 and x < w:
+      for y in 0..<h:
+        tb.write(x, y, fgGreen, styleDim, "│")
+  for d in 1..<8:
+    let y = d * h div 8
+    if y > 0 and y < h:
+      for x in 0..<w:
+        tb.write(x, y, fgGreen, styleDim, "─")
 
-  # Center crosshair (shown for both gsGrid and gsCross)
+  # Center crosshair
   for x in 0..<w: tb.write(x, cy, fgGreen, styleDim, "─")
   for y in 0..<h: tb.write(cx, y, fgGreen, styleDim, "│")
   tb.write(cx, cy, fgGreen, "┼")
 
-  if grid == gsGrid:
-    # Intersections
-    for dx in 1..<10:
-      let x = dx * w div 10
-      if x > 0 and x < w:
-        for dy in 1..<8:
-          let y = dy * h div 8
-          if y > 0 and y < h:
-            tb.write(x, y, fgGreen, styleDim, "┼")
+  # Intersections
+  for dx in 1..<10:
+    let x = dx * w div 10
+    if x > 0 and x < w:
+      for dy in 1..<8:
+        let y = dy * h div 8
+        if y > 0 and y < h:
+          tb.write(x, y, fgGreen, styleDim, "┼")
 
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