10 July Release to Production

[jenbreese]

READY FOR REVIEW

Summary

• Promotes the accumulated calculator work from late June through 10 July from dev to 1.x (production).
• Bundles 16 feature and fix PRs across the calculator suite. Headline items: a corrected interest-rate solver in the Time Value of Money calculator, a fix for currency input corruption in the Inflation Impact calculator, and the rollout of inline validation and error messaging across the suite.
• All blocker and high-priority issues raised during review are resolved.

Review By (Date)

• 10 July 2026 (same day, tied to the production deploy). Adjust if the deploy window moves.

Criticality

• 6 of 10. Scoped to a single product (the IFDM learning apps calculator suite), but it is the production release feeding a live client class, so accuracy regressions would be user-facing.

Review Tasks

Setup tasks and/or behavior to test

1. Check out this branch (dev merged into 1.x).
2. yarn install
3. yarn dev
4. Time Value of Money: solve for interest rate using a high rate and using a case where the compounding and payment frequencies differ. Confirm the returned rate is correct. Solve a present value with the rate set to zero and confirm no calculation error.
5. Inflation Impact: enter a dollar amount, then edit that same field a second time and confirm the value is not scrambled. Enter a negative value where appropriate and confirm it is accepted. Confirm the empty-field error does not fire until entry is complete.
6. Interest: check percentage entries at the edges, confirm the layout and on-screen guidance render correctly.
7. Compounding Frequency: confirm the default period is Annual.
8. Across the suite: leave a required field empty or enter an invalid value and confirm a clear inline prompt appears.

Front End Validation

• Is the markup using the appropriate semantic tags and passes HTML validation?
• Cross-browser testing has been performed?
• Automated accessibility scans performed?
• Manual accessibility tests performed?
• Design is approved by @ user?

Backend / Functional Validation

Code

• Are the naming conventions following our standards?
• Does the code have sufficient inline comments?
• Is there anything in this code that would be hidden or hard to discover through the UI?
• Are there any code smells?
• Are tests provided? The TVM interest-rate math is covered by the Vitest suite; solver test updates are included in this release.

Code security

• Are all forms properly sanitized?
• Any obvious security flaws or new areas for attack?

General

• Is there anything included in this PR that is not related to the problem it is trying to solve?
• Is the approach to the problem appropriate?

Affected Projects or Products

• IFDM learning apps calculator suite (Time Value of Money, Inflation Impact, Interest, Compounding Frequency, Mortgage v2). Deployed via GitHub Pages.

Associated Issues and/or People

• Bundled PRs: Error updates for the TVM calculator #134, fixup #136, fixup for 6/25 changes #139, Error doc: Compounding frequency calculator #140, Error doc inflation #141, Added errors and standards to interest cal #142, TVM Calculator: Input defaulting, zero-rate PV fix, and frequency default #144, Mortgage Calc v2 error word doc #145, TVM: Fix to the interest rate calculator #146, Change default to Annual #147, Changes to the math, errors, layout #148, Inflation 709 #151, # Fix: TVM interest-rate solver returns correct rate for high-rate and edge cases #152, Fix: currency input corrupts value and mistimes empty error on re-edit #153, Fix: TVM interest-rate solver returns high and mixed-frequency rates correctly #154, Blocker and High priority fixes #156
• JIRA ticket(s): [add ticket references]
• Notify: [reviewer @mention], and Rachel for client review sign-off.

Resources

• [AMP Tool](https://stanford.levelaccess.net/index.php)
• [Accessibility Manual Test Script](https://docs.google.com/document/d/1ZXJ9RIUNXsS674ow9j3qJ2g1OAkCjmqMXl0Gs8XHEPQ/edit?usp=sharing)
• [HTML Validator](https://validator.w3.org/)
• [Browserstack](https://live.browserstack.com/dashboard) and link to [Browserstack Credentials](https://asconfluence.stanford.edu/confluence/display/SWS/External+Account+Credentials)