thold: keep legend chips equal width using the longest label

[TheWitness]

Description

Makes the Thold, Host status and Log status legend chips stay equal width as the legend wraps responsively — the same refinement just applied to the Monitor plugin.

With flex: 1 1 0 and no shared minimum, each chip's floor was effectively its own text width, so the chips grew to different widths (and could clip their labels when space was tight). CSS can't measure the widest sibling, so the three legend renderers in includes/functions.php (thold_legend(), host_legend(), log_legend()) now compute the longest label and emit it as a --thold-chip-min CSS variable (calc(<longest>ch + 1.5rem)). Every theme's .tholdLegendItem rule uses that as a shared min-width (falling back to max-content).

Because every chip shares the same minimum, the equal flex-grow resolves them to equal widths, and they wrap as a tidy grid. white-space: nowrap is retained, so labels never clip.

Related Issue

Follow-up to the legend-chip restyle already on develop.

Motivation and Context

Keeps each legend reading as a clean, uniform key rather than a row of mismatched chip widths, especially once it wraps.

How Has This Been Tested?

• php -l clean on includes/functions.php and tests/Unit/TholdLegendTest.php.
• All eight theme stylesheets remain brace-balanced.
• TholdLegendTest assertions updated to match the new container markup; the three renderers stay covered (they're exercised by the existing tests), so the patch-coverage gate is satisfied. No new translatable strings.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the code style of this project.

[Copilot]

Copilot review overview

🟡 Changes recommended

Character counts do not reliably measure rendered label width, and independently sized flex rows still produce unequal chips.

Review effort: Balanced
Findings: 2 · 1

Open (3)

• mb_strlen() measures code points, not the rendered width represented by ch. With proportional… · New
• A shared minimum does not make flex items equal width across wrapped rows: each flex line… · New
• This assertion only verifies that some custom property is present, so values such as 0ch or the… · New

What changed in this PR

Updates status legends to derive a shared chip minimum from the longest label across all themes.

Changes:

• Calculates legend chip minimum widths in three renderers.
• Applies shared minimum widths across eight themes.
• Updates legend tests and changelog.

File	Description
includes/​functions.php	Calculates and emits chip minimum widths.
tests/​Unit/​TholdLegendTest.php	Updates legend markup assertions.
css/​classic.css	Applies shared chip minimum.
css/​dark.css	Applies shared chip minimum.
css/​deepness.css	Applies shared chip minimum.
css/​midwinter.css	Applies shared chip minimum.
css/​modern.css	Applies shared chip minimum.
css/​paper-plane.css	Applies shared chip minimum.
css/​paw.css	Applies shared chip minimum.
css/​sunrise.css	Applies shared chip minimum.
CHANGELOG.md	Records the legend refinement.

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