BL-16822 Book CSS for inline (Word-style) images, and a layout suite for it

[hatton]

The rules that make a picture sit inside a text block with the text flowing around
it: the four docks, the width and aspect-ratio custom properties the editor writes,
the vertical offset, and the shape-outside that gives the wrap its contour.

They live in their own file, src/content/bookLayout/inlineImages.less, because two
themes need them and a second copy would drift. basePage-sharedRules.less imports it
for the current themes; basePage-legacy-5-6.less imports the same file, because that
legacy copy of basePage.css was frozen long before this feature existed and a book
using the legacy theme can still contain a picture in its text.

This is the part of the feature that lands in published books, so it comes with its
own layout suite: bookEdit/inline-images-e2e/ builds pages from the compiled book CSS
and measures the wrap geometry directly. Unlike the canvas suite next to it, it needs
no running Bloom, which is why it is registered as its own pnpm e2e inline-images
target and excluded from the vitest globs.

Card: https://issues.bloomlibrary.org/youtrack/issue/BL-16822

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https://claude.ai/code/session_014DCBGajN5YyAYPBenEf1yy

Devin review

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This change is 

[hatton]

[Claude Opus 5 (1M context) from Hatton's machine during devin-review]

Consulted Devin on 2026-09-07 12:46 MDT up to commit ade2a255ca.

It raised nothing on this PR.

The fixes were amended into this branch after the review, so the commit above is not the current head; a fresh review is running against the new one. The only GitHub check on this PR is pr-automation (the review trigger), which passed; the front-end unit suite (915 tests), the C# spreadsheet tests (415) and the end-to-end suite (85) were all run locally and are green.