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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Fix highlight off-by-one, localise the UI, add tests

Anchoring (the core bug):
- Replace buildNormToRaw with normalizeWithMap so the normalised search
string and the normalised->raw index map are

Fix highlight off-by-one, localise the UI, add tests

Anchoring (the core bug):
- Replace buildNormToRaw with normalizeWithMap so the normalised search
string and the normalised->raw index map are built in one pass and share
the same trimming. DokuWiki indents its content markup, so the collected
text starts with a whitespace text node; the old untrimmed map shifted
every highlight by a character. Verified on the live wiki: a quote now
re-anchors exactly, including across element boundaries.
- Locate all matches first, then wrap last-to-first, so wrapping (which
splits text nodes) never disturbs a not-yet-wrapped offset.
- Fix a pre-existing orphan double-count: renderAll passed an orphan total
into updateCounter, which then recounted it from the _orphaned flags.

Localisation:
- Move front-end strings to $lang['js'] (exposed as LANG.plugins.annotations)
and read them via t()/fmt() with English fallbacks.
- Add de, ru and ja translations alongside en.

Conventions / cleanup:
- action.php: read request data via $INPUT; pass the CSRF token straight to
checkSecurityToken($token) instead of poking $_POST/$_REQUEST; unify admin
detection on auth_isadmin().
- helper.php: write annotation files with JSON_UNESCAPED_UNICODE | _SLASHES.
- Drop the dead ann-highlight-orphaned constant; set panel data-status so the
resolved accent in style.css applies.

Tests:
- Add _test/GeneralTest.php (manifest + conf invariant) and _test/HelperTest.php
(permission rules, CRUD, input cleaning, findOrphaned). 15 tests pass.

Docs: sync DESIGN.md and README.md; bump plugin.info.txt date.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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