fix: let active tmux clients control window size

Keep the global window-size=latest policy for linked web and iOS sessions so switching between phone and Mac sends SIGWINCH and reflows the shared pane.

scripts/tmux-web-attach.sh

@@ -44,14 +44,11 @@ tmux set-option -t "$tmp" mouse on
 first="$(tmux display-message -p -t "$tmp" '#{window_index}')"
 tmux link-window -k -s "$src" -t "$tmp:$first"
 
-# A tmux window has a single size shared by every viewer. With the global
-# "latest" policy a bigger local client cuts the browser view off, so pin this
-# window to "smallest" while a web viewer is attached: the browser always sees
-# the full content; a larger local client sees dotted padding instead.
-tmux set-window-option -t "$src" window-size smallest
+# A tmux window has one size shared by every viewer. Keep the global
+# "window-size latest" policy so the most recently active Mac, web, or iOS
+# client owns that size and full-screen programs receive SIGWINCH to reflow.
 
 cleanup() {
-  tmux set-window-option -u -t "$src" window-size 2>/dev/null || true
   tmux kill-session -t "$tmp" 2>/dev/null || true
 }
 trap cleanup EXIT HUP TERM INT