Make cf dropdown scroll instead of showing +N more

Arrow past the last visible item now scrolls the list smoothly.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/cmdforge/cli/picker.py

@@ -112,6 +112,7 @@ def run_picker() -> Optional[PickerResult]:
 
     query = ""
     selected = 0
+    scroll = 0
     last_drawn = 0
 
     print(HIDE_CURSOR, end='', flush=True)
@@ -133,21 +134,28 @@ def run_picker() -> Optional[PickerResult]:
             if selected >= len(filtered):
                 selected = max(0, len(filtered) - 1)
 
+            # Adjust scroll to keep selection visible
+            if selected < scroll:
+                scroll = selected
+            elif selected >= scroll + MAX_VISIBLE:
+                scroll = selected - MAX_VISIBLE + 1
+
             # Clear previous
             if last_drawn:
                 clear_dropdown(last_drawn)
 
             # Draw
-            visible = filtered[:MAX_VISIBLE]
+            visible = filtered[scroll:scroll + MAX_VISIBLE]
             lines = []
 
             # Query line
-            prompt = f"{DIM}>{RESET} {YELLOW}{query}{RESET}{'▌' if True else ''}"
+            prompt = f"{DIM}>{RESET} {YELLOW}{query}{RESET}▌"
             lines.append(prompt)
 
             # Items
             for i, t in enumerate(visible):
-                if i == selected:
+                actual_idx = scroll + i
+                if actual_idx == selected:
                     prefix = f"{CYAN}{BOLD}▸ {t['name']}{RESET}"
                 else:
                     prefix = f"  {t['name']}"
@@ -162,10 +170,6 @@ def run_picker() -> Optional[PickerResult]:
 
                 lines.append(prefix)
 
-            # Show count if more
-            if len(filtered) > MAX_VISIBLE:
-                lines.append(f"{DIM}  ... +{len(filtered) - MAX_VISIBLE} more{RESET}")
-
             # Print
             sys.stdout.write('\n'.join(lines) + '\n')
             sys.stdout.flush()
@@ -204,10 +208,12 @@ def run_picker() -> Optional[PickerResult]:
             elif ch == '\x7f' or ch == '\b':  # Backspace
                 query = query[:-1]
                 selected = 0
+                scroll = 0
 
             elif ch.isprintable():
                 query += ch
                 selected = 0
+                scroll = 0
 
     except Exception as e:
         print(SHOW_CURSOR, end='', flush=True)