feat(a11y): VoiceOver labels, dense-row rotor content, announcements (#21 phase 4)

The audit count is unchanged at 11 dark, and that is the expected
result: performAccessibilityAudit validates descriptions, traits,
contrast, hit regions, and clipping, but exercises none of VoiceOver's
speech, the More Content rotor, custom-content ordering, or
announcements — which is the entire substance of this phase. It is
verified by construction and stays green with no regressions; the
manual VoiceOver pass is Phase 6.

Icon-only controls (~14) get accessibilityLabel, obeying label-in-name:
where a control has visible text the label keeps it, so Voice Control
still works. The pin and bookmark toggles gain accessibilityValue and
.isSelected; the audit and workflow checkboxes gain .isSelected and a
hint. Decorative icons split out of Labels are hidden.

AppStatusBadgeView now reads as one word ("Critical"), not "icon,
Critical", via children: .ignore + label. SectionTitleView and
CollapsibleSectionView headers get the .isHeader trait for rotor
navigation; the collapsible header also exposes expanded/collapsed as a
value with a hint. The header deliberately does NOT use children:
.combine — its trailing() closure can hold Track/Pin controls, and
combining would swallow them.

Dense rows use combine-for-summary, custom-content-for-detail.
BatchResultRowView (8 elements) and WatchlistRowView (up to 9) become a
single element — domain as label, status as value — with risk, IP,
timestamp, source, certificate, and monitoring on the More Content
rotor, risk and certificate at .high importance. Reading all of it
inline would make a long sweep unnavigable. The custom-content chains
live in ViewModifiers because inlining six of them plus the layout broke
the type-checker. The shorter 3-4 element portfolio rows are left to
NavigationLink's automatic combine, per WWDC21-10121.

Technical strings get a speechStyle field on InfoRowViewData:
.technical applies speechAlwaysIncludesPunctuation and
accessibilityTextContentType(.sourceCode), set on DNS record values and
cipher suites so load-bearing punctuation is not swallowed.

Completion announcements: the sweep posts from the view model; the
single lookup posts from an onChange in the view, since resultsLoaded is
derived from many loading flags and has no single view-model moment.

Widget: each domain row was a silent 8pt status dot plus a bare "12d"
countdown. Rows now read as one phrase ("example.com, critical,
certificate expires in 12 days"); the count pills are labelled.

Not verifiable by the suite: the dense rows and the widget never render
in the audit (no tracked domains or batch results in the test
simulator), same limit as the deferred Phase 3 row reflow. Documented in
Docs/ACCESSIBILITY.md.

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