fix(a11y): add aria-label to CRON schedule input

[eschutho]

WCAG rule

2.1 SC 1.3.1 (Info and Relationships) / 3.3.2 (Labels or Instructions) — Level A.

What changed

The CRON expression text input in AlertReportCronScheduler (shown when a user picks "CRON Schedule" for an alert/report) had no aria-label, aria-labelledby, or associated <label>. Its only hint was a placeholder (t('CRON expression')) plus a visually adjacent but unassociated <div className="control-label"> reading "Schedule". Screen reader users tabbing into the field heard no accessible name at all.

Added aria-label={t('Schedule')} to the <Input>, matching the naming convention already used by the sibling Select above it (ariaLabel={t('Schedule type')}, mirroring its own adjacent visible label).

Behavior

No visual or functional change — this only adds an accessible name for assistive technology.

Test plan

1. Open Alerts & Reports → create/edit an alert → in the "Schedule" section, switch schedule type to "CRON Schedule".
2. Tab to the CRON expression input with a screen reader running (e.g. VoiceOver/NVDA).
3. Verify the announced label is "Schedule" (previously: no accessible name announced, or generic "edit text").

[bito-code-review]

Code Review Agent Run #8b332c

Actionable Suggestions - 0

Review Details

• Files reviewed - 1 · Commit Range: ebdfd2b..ebdfd2b

  • superset-frontend/src/features/alerts/components/AlertReportCronScheduler.tsx
• Files skipped - 0
• Tools

  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.66%. Comparing base (687fafd) to head (ed82acf).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #41769   +/-   ##
=======================================
  Coverage   64.66%   64.66%           
=======================================
  Files        2685     2685           
  Lines      148593   148593           
  Branches    34282    34282           
=======================================
  Hits        96088    96088           
  Misses      50740    50740           
  Partials     1765     1765           

Flag	Coverage Δ
javascript	69.50% <ø> (ø)

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