fix(web): associate app deletion confirmation label

[lyzno1]

Summary

• Associate the existing visible deletion-confirmation label with its input through React.useId(), htmlFor, and id.
• Preserve the localized instruction as the textbox accessible name.
• Remove the exact label-has-associated-control suppression made obsolete by this change.

Boundary

• No Input or AlertDialog migration.
• No submission, state, copy, class, spacing, or layout changes.
• The separately baselined legacy Input import remains out of scope.
• Dify UI documents Form and Field migration as a submit-boundary and primitive migration; that larger visual and behavioral change belongs in its own reviewed stack, not this label-only PR.

Validation

• Added the semantic role/name test first and observed it fail before implementation.
• pnpm --dir web exec vp test run app/components/app-sidebar/app-info/__tests__/app-info-modals.spec.tsx: 18/18 passed.
• pnpm check: passed with 0 errors; existing warnings remain baselined.
• Targeted lint, format, and git diff --check: passed.
• Standalone accessibility lint no longer reports label-has-associated-control; it still reports the pre-existing restricted legacy Input import.

Visual review

• Expected visual delta: none. The rendered boxes, classes, text, and DOM nesting are unchanged; only id and for attributes are added.
• Intended behavior delta: clicking the visible label now focuses the confirmation input.

Rollback

• Revert commit bb321beb25eddb65e8d211be38d7a2fb1b84c867. This PR is an independent root and has no child dependency.

From Codex.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.43%. Comparing base (7522ae1) to head (bb321be).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #40375      +/-   ##
==========================================
- Coverage   86.47%   86.43%   -0.05%     
==========================================
  Files        5264     5107     -157     
  Lines      294867   290741    -4126     
  Branches    59029    57924    -1105     
==========================================
- Hits       254976   251290    -3686     
+ 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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