fix(web): name generated result copy action

[lyzno1]

Summary

• Give the icon-only generated-result copy button an explicit accessible name.
• Hide the clipboard icon from the accessibility tree because the button now owns the semantics.
• Replace the owner test's positional button query with a role-and-name query.

Behavior contract

• Assistive technology identifies the action as Copy.
• Activating it still copies the current generated result and shows the existing success toast.
• Version selection and Apply behavior remain covered and unchanged.

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 one test query.

The existing prefer-tailwind-icons warning is intentionally left unchanged so icon implementation can be reviewed separately.

Validation

• pnpm exec vp check app/components/app/configuration/config/automatic/result.tsx app/components/app/configuration/config/automatic/tests/result.spec.tsx (0 errors, 1 existing icon warning)
• node scripts/lint-a11y.mjs app/components/app/configuration/config/automatic/result.tsx
• pnpm exec vp test run app/components/app/configuration/config/automatic/tests/result.spec.tsx (3/3)
• pnpm check (0 errors, 2059 existing warnings)

From Codex

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.42%. Comparing base (e036075) to head (e008479).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #40259   +/-   ##
=======================================
  Coverage   86.41%   86.42%           
=======================================
  Files        5107     5107           
  Lines      290731   290750   +19     
  Branches    57917    57923    +6     
=======================================
+ Hits       251245   251271   +26     
+ Misses      34545    34538    -7     
  Partials     4941     4941           

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

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