fix: fill full terminal width — pad all lines to cols

Every line now pads to the full terminal width so there are
no gaps. Empty lines below content are filled with spaces.

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

briefing

@@ -550,20 +550,34 @@ def tui_viewer(range_days, client):
     def split_lines(content):
         return content.split('\n')
 
+    ANSI_ESC = re.compile(r'\x1b\[[0-9;]*m')
+
+    def visible_len(s):
+        """Length of string excluding ANSI escape codes."""
+        return len(ANSI_ESC.sub('', s))
+
     def render():
         rows, cols = get_terminal_size()
         view_height = rows - 1  # bottom row = status bar
 
-        # Move cursor to top-left, clear screen
-        out = '\033[H\033[2J'
+        # Move cursor to top-left
+        out = '\033[H'
 
         for i in range(view_height):
             line_idx = scroll + i
+            out += f'\033[{i+1};1H'
             if line_idx < len(lines):
                 line = lines[line_idx]
-                out += f'\033[{i+1};1H{line}\033[K'
+                # Pad line to fill terminal width
+                pad = cols - visible_len(line)
+                if pad > 0:
+                    out += line + ' ' * pad
                 else:
-                out += f'\033[{i+1};1H\033[K'
+                    out += line
+            else:
+                # Empty line — fill with spaces
+                out += ' ' * cols
+            out += '\033[0m'
 
         # Status bar (bottom row, reverse video)
         if input_mode: