fix: repair terminal rendering

[lixd]

Summary

• remove width constraints that compress the xterm.js canvas
• keep the window resize handler stable and cancel pending debounce on unmount

Validation

• eslint src/components/Terminal/terminal.jsx --quiet
• CI=1 yarn test:unit (8 suites, 50 tests)
• yarn build true
• deployed and verified on sh-dev-2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.24%. Comparing base (c8ec5fe) to head (6d5b0be).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
- Coverage   47.30%   45.24%   -2.07%     
==========================================
  Files           7        8       +1     
  Lines         613      767     +154     
  Branches      176      224      +48     
==========================================
+ Hits          290      347      +57     
- Misses        250      333      +83     
- Partials       73       87      +14     

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