fix(web): name dataset configuration actions

[lyzno1]

Summary

• Give the dataset configuration card edit and remove actions explicit accessible names.
• Hide the Remix icons from the accessibility tree because the button names now own the semantics.
• Query the actions by role and accessible name in the owner tests instead of relying on DOM order.

Behavior contract

• Assistive technology identifies the two icon-only actions as Edit and Remove.
• Editing still opens the settings drawer, saving still closes it, and the mobile overlay behavior remains covered.
• Removing still invokes the existing callback, including the existing destructive hover state.

Visual regression

No visual change is expected. This PR does not change elements, classes, styles, layout, node order, or event handlers; it only adds ARIA attributes and strengthens test queries.

The two existing prefer-tailwind-icons warnings in this component are intentionally left unchanged so an icon implementation migration can be reviewed separately.

Validation

• pnpm exec vp check web/app/components/app/configuration/dataset-config/card-item/index.tsx web/app/components/app/configuration/dataset-config/card-item/tests/index.spec.tsx
• node scripts/lint-a11y.mjs web/app/components/app/configuration/dataset-config/card-item/index.tsx
• pnpm exec vp test run web/app/components/app/configuration/dataset-config/card-item/tests/index.spec.tsx (5/5)
• pnpm check (0 errors, 2059 existing warnings)

From Codex

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.43%. Comparing base (7522ae1) to head (d658142).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #40254      +/-   ##
==========================================
- Coverage   86.47%   86.43%   -0.05%     
==========================================
  Files        5264     5107     -157     
  Lines      294867   290742    -4125     
  Branches    59029    57924    -1105     
==========================================
- Hits       254976   251291    -3685     
+ Misses      34950    34510     -440     
  Partials     4941     4941              

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

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