fix: keep long tokens in wrapping <pre> blocks on screen (#5820)

[atomantic]

Summary

Layout's root shell is overflow-x-hidden, so a child wider than the viewport is clipped, not scrollable — there is no scrollbar to recover the overflowing edge. whitespace-pre-wrap only wraps at whitespace, so a <pre> carrying it alone still runs off that edge as soon as its content holds one unbroken token: an absolute path, a URL, a base64 blob, a minified JSON line, a stack frame.

#5675 fixed the two <pre> openers that had no wrap class at all, plus the two in JobCard.jsx. This is the remaining sweep: 35 blocks across 27 files, each classified by what it renders, following the split JobCard.jsx established.

• Machine output → break-all (matching components/ui/ProcessLogLines.jsx, the canonical log renderer): llama.cpp / mtplx / slotstream server logs, the local-setup install log, runner and provider command output, browser logs, JSON dumps (TrustTab, VoiceTab, HistoryPage details), error traces, agent transcripts and raw model output in the capability tests, the resume-agent context blob, and the digital-twin export payload.
• Human-authored prose → break-words (breaks a word only when it cannot fit on a line of its own): prompt templates and previews (PromptEditor, PromptManager, Loops, NextActionBanner, the capability-test "what PortOS will send" panel), creative-director style specs / user stories / treatment prompts, the comic-script markdown source, digital-twin soul documents and bios, and wiki note bodies.

Nothing else changes: Layout's overflow-x-hidden is untouched (it is what stops one wide child from giving the whole app a horizontal scrollbar), and no overflow-x-auto was added — a horizontal scroller inside a card is worse on touch than a block that keeps every character reachable at 360px.

New tree-wide guard client/src/preWrapClasses.test.js fails when any git-tracked non-test <pre> opener carries whitespace-pre-wrap without a break class, so blocks added later are covered too. It reads each opening tag whole rather than line by line — LocalSetupPanel.jsx splits its attributes across lines, and the line-scoped grep in the issue passed straight over it. It follows the existing convention-guard shape (popoverClampConventions.test.js) and reuses the shared test/trackedFiles.js + test/classNameScan.js helpers.

Closes #5820

Test plan

• client/src/preWrapClasses.test.js — 3 cases: the tree is populated, a bypass probe asserting the detector flags the bug and clears every safe form (break class present, no wrap class at all, multi-line opener, interpolated class branches, a > inside the class expression, overflow-x-auto as a non-substitute, a <preview> tag, a doc comment quoting an example), and the tree-wide sweep.
• Guard verified to fail pre-fix: stripping break-all from RunnerPage.jsx:510 and from the multi-line LocalSetupPanel.jsx:269 opener turned the suite red naming both — including the one a line-scoped grep cannot see. Restored, green again.
• The issue's enumeration grep now returns no results.
• cd client && npm test — Test Files 827 passed | 1 skipped (828), Tests 10110 passed | 2 skipped. (One earlier run had two unrelated PostSessionLauncher drill-selection flakes that pass in isolation and did not recur.)
• cd client && npm run lint — clean.
• Server suite not run: the change touches only client/src, which the server Vitest project does not glob.