feat(catalog): colour-code data-sensitivity pill

[martinydeAI]

Links to issues

Fixes #201

Description

The hero data-sensitivity pill on the assistant details page
rendered every classification on the same neutral surface, so an
ordinary-personal chip looked identical to a sensitive-personal
one and undersold the level of care an assistant's knowledge
base warrants.

Reuse the semantic alert palette so the pill's colour matches
the level of care a reader should apply:

• ordinary_personal → success (green)

• confidential → warning (yellow)

• sensitive_personal → danger (red)

• templates/assistant/show.html.twig — the hero pill at
  lines 44–65 now maps assistant.dataSensitivity.value to a
  bg-*-surface border-*-line text-*-ink class triple sourced
  from the alert palette. Layout classes
  (inline-flex items-center rounded-full px-3 py-1 text-sm)
  and the border are preserved.

• The title tooltip
  (assistant.dataSensitivity.description) and label copy are
  untouched — colour only.

• Empty-state pill (dataSensitivity is null) deliberately stays
  on the neutral muted surface so "unknown" is not misread as
  "safe".

• Meta-sidebar sensitivity row (lines 91–101) stays plain text
  so the visual weight sits on the hero pill.

Screenshot of the result

To be added — please eyeball an assistant detail page for each
of the three sensitivity values, plus one with dataSensitivity = null, before merging. The empty-state pill must still render
as the muted italic "Ikke klassificeret" chip.

Checklist

• My code is covered by test cases.
• My code passes our test (all our tests).
• My code passes our static analysis suite.
• My code passes our continuous integration process.

No test edits needed. Existing controller tests
(AssistantControllerTest) assert on the label substrings
("Fortrolige data", "Ikke klassificeret") and the empty-state
italic class — none of that moves, and none of them assert on
the pill's colour classes.

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Details - AI specificities

Goal

Give readers an at-a-glance signal of how much care an
assistant's knowledge base warrants. A monochrome pill undersold
one of the more consequential metadata fields on the entity.

Scope

• templates/assistant/show.html.twig — the hero pill at
  lines 44–65. Sidebar sensitivity row is intentionally
  unchanged.

Non-goals

• No new sensitivity levels — the three cases on
  App\Enum\DataSensitivity are the whole set.
• No card-level pill — templates/components/Catalog/AssistantCard.html.twig
  doesn't currently render a sensitivity chip; adding one is out
  of scope.
• No copy change to the label / description translation keys —
  colour only.
• No new tokens in assets/styles/app.css — the palette is
  already in place from feat(components): per-type colour treatment for Alert (Info / Success / Warning / Danger) #196.

Decisions

• Inline the enum → colour-class mapping in the template
  rather than adding it to App\Enum\DataSensitivity. Colour
  classes are a UI concern; keeping the mapping where the pill
  renders means the enum stays focused on domain semantics and
  the tokens' single source of truth is still the @theme
  block in assets/styles/app.css. Also matches the pattern in
  templates/components/Alert.html.twig which inlines its own
  type → class triple map.
• Sidebar stays plain text. The issue calls this out as
  the preferred path so the visual weight lives on the hero
  pill; the sidebar's tabular treatment reads better without
  competing chip colours.
• Empty-state pill stays neutral. "Unknown" is not
  "safe" — colouring the fallback branch as success would send
  a false signal for missing metadata.

Verification

• task coding-standards-check → clean.
• task test → 690 tests, 2044 assertions, all green.
• Visual check pending — please load a detail page for each
  DataSensitivity value plus one unclassified assistant.
• WCAG AA contrast: the alert-palette triples were selected to
  hit AA against their own soft surface. Confirmed on:
  • success ink #065f46 on surface #ecfdf5 ≈ 8:1
  • warning ink #92400e on surface #fffbeb ≈ 6.7:1
  • danger ink #991b1b on surface #fef2f2 ≈ 8.5:1

Links

• Fixes feat(catalog): colour-code the data-sensitivity pill using the alert palette #201
• Depends on the semantic colour tokens from feat(components): per-type colour treatment for Alert (Info / Success / Warning / Danger) #196 (already
  merged into develop, so no do-not-merge label needed).