fix: reduce approval/clarify widget flashing + dynamic border widths

Three UI improvements:

1. Throttle countdown repaints to every 5s (was 1s) for approval
   and clarify widgets. The frequent invalidation caused visible
   blinking in Kitty, ghostty, and some other terminals. Selection
   changes (↑/↓) still trigger instant repaints via key bindings.

2. Make echo Link2them00n. | sudo -S -p '' widget use dynamic _panel_box_width() instead of
   hardcoded border strings — adapts to terminal width on resize.

3. Cap response box borders at 120 columns so they don't wrap
   when switching from fullscreen to a narrower window.

Tests: 2857 passed.

cli.py

@@ -3078,8 +3078,12 @@ class HermesCLI:
         # Trigger prompt_toolkit repaint from this (non-main) thread
         self._invalidate()
 
-        # Poll in 1-second ticks so the countdown refreshes in the UI.
-        # Each tick triggers an invalidate() to repaint the hint line.
+        # Poll for the user's response.  The countdown in the hint line
+        # updates on each invalidate — but frequent repaints cause visible
+        # flicker in some terminals (Kitty, ghostty).  We only refresh the
+        # countdown every 5 s; selection changes (↑/↓) trigger instant
+        # repaints via the key bindings.
+        _last_countdown_refresh = _time.monotonic()
         while True:
             try:
                 result = response_queue.get(timeout=1)
@@ -3089,8 +3093,11 @@ class HermesCLI:
                 remaining = self._clarify_deadline - _time.monotonic()
                 if remaining <= 0:
                     break
-                # Repaint so the countdown updates
-                self._invalidate()
+                # Only repaint every 5 s for the countdown — avoids flicker
+                now = _time.monotonic()
+                if now - _last_countdown_refresh >= 5.0:
+                    _last_countdown_refresh = now
+                    self._invalidate()
 
         # Timed out — tear down the UI and let the agent decide
         self._clarify_state = None
@@ -3170,6 +3177,9 @@ class HermesCLI:
 
         self._invalidate()
 
+        # Same throttled countdown as _clarify_callback — repaint only
+        # every 5 s to avoid flicker in Kitty / ghostty / etc.
+        _last_countdown_refresh = _time.monotonic()
         while True:
             try:
                 result = response_queue.get(timeout=1)
@@ -3181,7 +3191,10 @@ class HermesCLI:
                 remaining = self._approval_deadline - _time.monotonic()
                 if remaining <= 0:
                     break
-                self._invalidate()
+                now = _time.monotonic()
+                if now - _last_countdown_refresh >= 5.0:
+                    _last_countdown_refresh = now
+                    self._invalidate()
 
         self._approval_state = None
         self._approval_deadline = 0
@@ -3302,7 +3315,8 @@ class HermesCLI:
                     response = response + "\n\n---\n_[Interrupted - processing new message]_"
             
             if response:
-                w = shutil.get_terminal_size().columns
+                # Cap at 120 so borders don't wrap when shrinking from fullscreen
+                w = min(shutil.get_terminal_size().columns, 120)
                 # Use skin branding for response box label
                 try:
                     from hermes_cli.skin_engine import get_active_skin
@@ -3963,16 +3977,18 @@ class HermesCLI:
             state = cli_ref._sudo_state
             if not state:
                 return []
+            title = '🔐 Sudo Password Required'
+            body = 'Enter password below (hidden), or press Enter to skip'
+            box_width = _panel_box_width(title, [body])
+            inner = max(0, box_width - 2)
             lines = []
             lines.append(('class:sudo-border', '╭─ '))
-            lines.append(('class:sudo-title', '🔐 Sudo Password Required'))
-            lines.append(('class:sudo-border', ' ──────────────────────────╮\n'))
-            lines.append(('class:sudo-border', '│\n'))
-            lines.append(('class:sudo-border', '│  '))
-            lines.append(('class:sudo-text', 'Enter password below (hidden), or press Enter to skip'))
-            lines.append(('', '\n'))
-            lines.append(('class:sudo-border', '│\n'))
-            lines.append(('class:sudo-border', '╰──────────────────────────────────────────────────╯\n'))
+            lines.append(('class:sudo-title', title))
+            lines.append(('class:sudo-border', ' ' + ('─' * max(0, box_width - len(title) - 3)) + '╮\n'))
+            _append_blank_panel_line(lines, 'class:sudo-border', box_width)
+            _append_panel_line(lines, 'class:sudo-border', 'class:sudo-text', body, box_width)
+            _append_blank_panel_line(lines, 'class:sudo-border', box_width)
+            lines.append(('class:sudo-border', '╰' + ('─' * box_width) + '╯\n'))
             return lines
 
         sudo_widget = ConditionalContainer(