Try xterm renderer addons for terminal

[matthewlouisbrockman]

renderer addons make everything better

after:

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PR Summary

Low Risk
Client-only terminal UX changes with graceful renderer fallback; no auth, API, or data-path changes.

Overview
Adds @xterm/addon-fit, @xterm/addon-webgl, and @xterm/addon-canvas and wires them into useTerminalInstance for sharper rendering and better container sizing.

FitAddon runs at the start of resizeTerminal() so the terminal tracks the panel before cols/rows are computed and propagated to the PTY. WebglAddon is loaded first for performance; on init failure or WebGL context loss it falls back to CanvasAddon, with subscriptions and addons disposed on teardown. Initial transcript restore and post-resize paths now scroll to bottom so the view stays anchored on the latest output.

^{Reviewed by Cursor Bugbot for commit f23cf53. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Project	Deployment	Actions	Updated (UTC)
web	Ready	Preview, Comment	Jun 18, 2026 2:53am

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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^{Reviewed by Cursor Bugbot for commit dcc4c5a. Configure here.}

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