fix(web): use button for provider tool item

[lyzno1]

Summary

• replace the provider tool detail card with a native type=button
• use the localized tool label as its accessible name
• expose unavailable state through disabled
• verify Enter opens the detail and disabled items do not
• remove the two matching suppressions

Visual regression review

The card remains full width with identical padding, radius, border, background, shadow, hover, two-line clamp, disabled opacity, and cursor. appearance-none and text-start preserve platform chrome and logical alignment. The only intended new state is the keyboard focus-visible ring.

Verification

• owner suite: 2/2 passed
• standalone a11y lint: 0 diagnostics
• full static check: 0 errors
• suppression delta: -2
• diff check: passed

Dependency and rollback

Independent root layer; no settings form or icon refactor is included.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.43%. Comparing base (7522ae1) to head (99b9861).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #40362      +/-   ##
==========================================
- Coverage   86.47%   86.43%   -0.05%     
==========================================
  Files        5264     5107     -157     
  Lines      294867   290740    -4127     
  Branches    59029    57923    -1106     
==========================================
- Hits       254976   251289    -3687     
+ Misses      34950    34510     -440     
  Partials     4941     4941              

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

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