fix(web): name the chat history settings trigger

[lyzno1]

Summary

• give the chat-history settings icon button the existing translated settings title as its accessible name
• mark the trigger icon decorative
• tighten the component tests from an unnamed button query to role + name

Behavior contract

• Dify UI Popover continues to own trigger state, focus, and disclosure behavior
• ActionButton continues to own the visual button contract
• the visible popover title and trigger name share the same existing translation key
• no test id is introduced; behavior is located through the accessible role and name

Scope

Only the chat-with-history ViewFormDropdown implementation and its focused test.

The embedded-chat implementation is a separate owner already covered by #40199; this PR does not depend on or modify that implementation.

Test evidence

The updated tests failed first because the existing trigger had button role but an empty accessible name. After the production change, all 3 tests pass while continuing to cover open, close, multiple form items, and visual action state.

Visual regression

The production diff only adds aria-label and aria-hidden attributes. Elements, class names, styles, dimensions, order, pointer behavior, and open-state rendering are unchanged.

The two existing icon migration warnings are deliberately not folded into this PR because that would require a separate visual validation boundary.

Verification

• pnpm exec vp test run app/components/base/chat/chat-with-history/inputs-form/__tests__/view-form-dropdown.spec.tsx — 3/3
• targeted vp check — 0 errors
• node scripts/lint-a11y.mjs app/components/base/chat/chat-with-history/inputs-form/view-form-dropdown.tsx
• pnpm check — 0 errors, existing warnings only
• git diff --check

Stack

Base: main

This is a single-layer, independently reviewable and revertible PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.42%. Comparing base (e036075) to head (a448222).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #40246   +/-   ##
=======================================
  Coverage   86.41%   86.42%           
=======================================
  Files        5107     5107           
  Lines      290731   290750   +19     
  Branches    57917    57923    +6     
=======================================
+ Hits       251245   251268   +23     
+ Misses      34545    34541    -4     
  Partials     4941     4941           

Flag	Coverage Δ
dify-ui	93.49% <ø> (ø)
web	86.11% <100.00%> (+<0.01%)	⬆️

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[lyzno1]

Closing as superseded by the consolidated owner PR #40341, which covers both chat ViewFormDropdown variants with action-oriented names and expanded-state tests.