KFX Style Fixes

Bug Fixes

sub/sup/small in headings: User CSS for <sub>, <sup>, and <small> elements was lost inside heading contexts (h1-h6) due to cascade override, missing baseline_style conversion, lack of style propagation to heading descendants, font-family normalization stripping inline styles, and missing paragraph context in title processing.
Font-size computation for em units in headings: Added RemToFontSizeMultiplier() to recover the original CSS multiplier from compressed rem values, enabling correct em-unit accumulation through nested inline elements inside headings.
CSS class/tag name collision: Class-only selectors matching HTML tag names (e.g., .h1 vs h1) collided in selectorStyleName(). Class selectors that collide are now prefixed with ".".
h1 font-size: Changed h1 default from 2.0rem to 1.5rem to match KP3's HTML5 section-depth-1 behavior (h1 inside a section is 1.5em, not 2.0em).
Inline images inside links: Links wrapping inline images (both cross-references and footnotes) incorrectly received an empty style instead of the proper link style (underline, superscript, etc.). Removed the wrong linkHasImage special case — KP3 applies identical styling regardless of link content.

Spurious DEBUG logs: Eliminated noisy log messages for pseudo-element rules (::before/::after content) and display: none by handling them before they reach the ignorable-pattern filter.

Full Changelog: v1.1.10...v1.2.0