fix(site-builder): final whole-branch review fixes

C1: HtmlBlock's PURIFY_CONFIG omitted 'style' from ALLOWED_ATTR, so the
toolbar colour picker added in this branch was silently deleted by
DOMPurify -- issue #2 was regressed, not fixed. Adds style/id plus table
tags, with tests pinning the markup path in both render and toHtml.

I3: PagesPanel's three confirmation states were not mutually exclusive;
cancelling delete revealed an unbidden reset prompt on a destructive action.

I5: orphan repair logged at console.warn, which the new console buffer
cannot see -- the reporter would never capture the most diagnostic signal
for the still-unreproduced drop bug. Also aligns useWhpApi's initial-load
failure handling with loadState's fallback.

I7: corrects comments (and the design spec) that asserted an orphan
"renders somewhere on the canvas", which a mid-plan audit disproved.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

craft/src/panels/right/GuidedStyles.tsx

@@ -165,7 +165,7 @@ export const GuidedStyles: React.FC = () => {
       {/* HTML -- code editor only */}
       {isHtml && <HtmlStylePanel selectedId={selected} nodeProps={nodeProps} />}
 
-      {/* UTILITY (Divider, Spacer, HTML) -- use generic but it works well for these */}
+      {/* UTILITY (Divider, Spacer) -- use generic but it works well for these */}
       {isUtility && <GenericPropsEditor selectedId={selected} nodeProps={nodeProps} typeName={typeName} />}
 
       {/* FALLBACK: Anything not matched above */}