fix(markdown): wrap long table cells without squeezing wide tables

[uvforce]

Summary

 .markdown-body th, .markdown-body td {
+  max-width: 240px;

Fixes #1052. Keep the natural table sizing and horizontal scrolling introduced by #650; bound long cell content rather than squeezing the entire table into the viewport.

Evidence

• Before: The new production-mode browser regression fails because a two-column table stretches beyond the chat.
  After: The same browser suite passes all 12 checks at 1280px and 390px. Long headings, English/Chinese sentences, URLs, and inline code wrap; an eight-column table still scrolls without squeezing ordinary values onto multiple lines.
• Lint and production build pass. Two local full-suite runs hit unchanged MCP startup/timing assertions (2281/2283 and 2282/2283); the unchanged MCP unit and integration files pass separately, 51/51 and 10/10. No existing assertions, timeouts, concurrency settings, or skips were changed. Official CI passes on Node 22.19.0: 2283/2283 tests (0 skipped), lint, build, and all 12 browser checks.

Merge Danger

Door: two-way
Blast Radius: Markdown

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