xterm-the-terminal-emulator and its three addons (fit, search,
serialize) used to be imported at module scope by Terminal.tsx,
BashExecModal.tsx, and HostConsole.tsx along with xterm's CSS.
Even though only Terminal.tsx is rendered eagerly inside the editor
layout, the static imports forced the ~660 KB xterm chunk plus the
xterm.css bytes into every cold app start regardless of whether a
user ever opened a terminal.
Move the bootstrap into a new frontend/src/lib/xtermLoader.ts
module. loadXtermModules() Promise.alls the four addon imports plus
the CSS, caches the result on a shared promise, and returns the
constructors. On rejection the cache is cleared so the next mount
can retry instead of rethrowing the same failed promise.
Three consumers (Terminal, BashExecModal, HostConsole) swap their
value imports for type-only InstanceType aliases from the loader,
then call loadXtermModules() inside their existing useEffect. A
mounted/cancelled flag in each effect closure prevents
initialisation if the component unmounts during the load.
The vite.config.ts manualChunks group from #823 already groups all
@xterm/* packages into the xterm chunk, so it now loads on demand
instead of being bundled into the entry chunk.
Anso