fix: refit terminal after sidebar toggle animation completes

toggleSidebar() flipped the sidebar--collapsed CSS class but never told
xterm.js to recalculate its dimensions. The terminal canvas kept its old
column/row count until a new session was opened (which creates a fresh
terminal that measures correctly on first fit()).

Fix: expose window._refitTerminal() from terminal.js, then call it via
a transitionend listener in toggleSidebar() so the terminal refits once
the 250ms CSS width/transform transition finishes.

Bumps version to 0.4.5.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "muxplex"
-version = "0.4.4"
+version = "0.4.5"
 description = "Web-based tmux session dashboard — access all your tmux sessions from any browser"
 readme = "README.md"
 license = { text = "MIT" }