Fix live copy edit paragraph resizing

[abdulwahabone]

Summary

• Preserve the selected text leaf's pre-edit white-space behavior while live Edit copy is active.
• Stop applying WebKit plaintext edit mode, which forces Chromium to render source newlines as visible line breaks and makes multi-line Astro copy grow.
• Regenerated provider skill copies from the source runtime script.

Validation

• Temporary Playwright repro against the homepage: failed before the fix with p.hero-rebuild-body height 107.5px -> 188.125px, passed after the fix. The repro test was removed before commit per request.
• bun run build
• node --test tests/live-browser-regression.test.mjs tests/live-browser-source.test.mjs
• node --test tests/live-commit-manual-edits.test.mjs
• bun run test

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Note

Low Risk
Localized live-browser inline edit styling with restore on teardown; no auth, data, or API surface changes.

Overview
Fixes live inline copy editing so multi-line paragraphs no longer grow in height while Edit copy is active.

During enableInlineEdit, each editable row now snapshots its inline white-space, then sets style.whiteSpace from getComputedStyle so wrapping matches the element’s normal layout. webkitUserModify: read-write-plaintext-only is removed; that WebKit mode was forcing Chromium to treat source newlines as visible breaks and inflate block height (e.g. hero body copy).

disableInlineEdit restores the saved white-space instead of clearing WebKit plaintext mode. The same logic is applied across live-browser.js in the canonical skill path and regenerated provider skill copies.

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