Inflation 709

[jenbreese]

READY FOR REVIEW

Summary

Two initial-price field fixes on the Inflation Impact Calculator:

1. The empty-field prompt no longer fires mid-edit. Clearing the field while
   focused shows nothing; the prompt appears only after the user leaves the
   field (blur). Range errors still show live.
2. Negative entries are kept and shown instead of being silently stripped.
   Typing -1000 now displays -1,000 and surfaces the range warning
   ("Enter an amount between $0.01 and $1,000,000,000.") immediately, so the
   user sees exactly what they typed alongside the mistake.

Review By (Date)

• [date]

Criticality

• 3/10. Scoped to one field on one interactive (Inflation Impact Calculator).
  No math or data changes; input-validation UX only.

Review Tasks

Setup tasks and/or behavior to test

1. Check out this branch and open the Inflation Impact Calculator.
2. Empty-on-blur: clear the Initial price field. Confirm no error shows while
   the field is still focused and the result shows the "-" placeholder. Click
   away and confirm the empty prompt appears.
3. Negative entry: type -1000. Confirm the field shows -1,000 (not a
   stripped 1,000) and the range warning shows live, before blur.
4. Recovery: replace the negative with a valid amount and confirm the warning
   clears and the result recalculates.
5. Range bounds still enforced: values below $0.01 or above $1,000,000,000
   trigger the range warning.

Front End Validation

• Markup uses appropriate semantic tags and passes HTML validation
• Cross-browser testing performed
• Automated accessibility scans performed (aria-invalid tracks the visible
  error state, so an empty pre-blur field is not announced as invalid)
• Manual accessibility tests performed (VoiceOver: error announced on blur,
  range error announced live)
• Design approved by @[reviewer]

Backend / Functional Validation

Code

• Naming conventions follow our standards
• Code has sufficient inline comments
• Nothing hidden or hard to discover through the UI
• No code smells
• Tests provided (if applicable)

Code security

• Inputs handled safely (numeric parse + range guard; no raw passthrough)
• No new areas for attack

General

• Nothing included that is unrelated to the problem being solved
• Approach to the problem is appropriate

Affected Projects or Products

• ifdm_learning_apps: Inflation Impact Calculator only.

Associated Issues and/or People

• JIRA ticket(s): [ticket]
• Other PR: n/a

[majimmy88]

LGTM