Add admin overview of annotated pages with clear-orphaned actions

Adds admin.php (Admin -> Annotations): a wiki-wide table of annotated pages
with Normal/Orphaned counts, per-column filter, sortable

Add admin overview of annotated pages with clear-orphaned actions

Adds admin.php (Admin -> Annotations): a wiki-wide table of annotated pages
with Normal/Orphaned counts, per-column filter, sortable headers, numbered
pager (entries_per_page config), and per-page and wiki-wide clear-orphaned
POST actions guarded by checkSecurityToken and auth_isadmin.

Refactors the orphan rule into helper::quoteMissing() shared by
findOrphaned() and the new pageCounts(); adds getAnnotatedPages() /
searchAnnotations() / clearOrphanedAll() to the helper. Extends HelperTest
with four new coverage cases. All four locales (en, de, ru, ja) carry the
new admin strings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Add config, selection guards, annotation overlap detection, and glow button

- Config: color_open / color_resolved (hex, drives CSS vars); embed_max_bytes,
context_length, body_cap move from consta

Add config, selection guards, annotation overlap detection, and glow button

- Config: color_open / color_resolved (hex, drives CSS vars); embed_max_bytes,
context_length, body_cap move from constants to conf/default + metadata.
action.php injects --ann-open-rgb / --ann-resolved-rgb as CSS custom props;
style.css escapes every rgba(var(…)) with LESS ~"…" so lesserphp doesn't
bake them to #000000 at compile time.
- Selection guards: Annotate button suppressed inside .ann-* UI, #dw__toc,
.docInfo, .secedit; the old endpoint-only isInsideHighlight is replaced by
selectionHitsHighlight (range.intersectsNode over all highlight spans) so a
selection overrunning an existing annotation on either side opens it instead
of offering a new overlapping one.
- Glow: static amber box-shadow on .ann-tooltip .ann-btn (no animation).
- Removed email line from plugin.info.txt; updated GeneralTest accordingly.
- context_length fed to JS via JSINFO.annotations.contextLen so capture and
PHP trimming stay in sync.
- conf/ + lang/*/settings.php + README/DESIGN updated.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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