Fix: show error for year with more than 4 digits in Time Formatter

[spring1843]

Fixes #281

When a user typed a year with more than 4 digits (e.g. `12345-01-01`) into the Time Formatter's date input, the tool silently produced no output. The fix validates the year portion of the date string before attempting to format, and shows a clear error message.

Changes

• `client/src/pages/tools/time-formatter.tsx`:

  • Added `yearError` state.
  • `formatTime` now checks the year segment of `inputDate`: if it has more than 4 characters (year > 9999), it sets an error message, clears the formatted results, and returns early.
  • `handleClear` and the input-change `useEffect` also clear `yearError` appropriately.
  • Added a red error banner (with `AlertCircle` icon) rendered between the input card and the results, tagged `data-testid="year-error"`.

• `tests/e2e/tools/time-formatter.spec.ts`: New test sets the date input to `12345-01-01` via the native value setter + synthetic events (bypassing the browser's date-picker UI), then asserts the error banner is visible, contains "4 digits", and no formatted results are shown.

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[Copilot]

Pull request overview

This PR fixes Time Formatter behavior when a user enters a year with more than 4 digits by validating the year segment up-front and displaying a clear inline error instead of silently producing no output.

Changes:

• Added yearError state and a year-length validation guard in formatTime to show an error and clear results when year > 9999.
• Added an inline error banner in the Time Formatter UI (with data-testid="year-error").
• Added an E2E test covering the invalid 5-digit year path and asserting no formatted results are shown.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
client/src/pages/tools/time-formatter.tsx	Adds year validation logic and renders an inline error banner when the year exceeds 4 digits.
tests/e2e/tools/time-formatter.spec.ts	Adds an E2E test ensuring a 5-digit year shows an error and clears formatted outputs.