[A11y] Add aria-describedby Instruction Link to Goal Target Input Field

• Labels: good first issue, accessibility, difficulty:beginner, area:core
• Target File: src/components/goals/goal-form-modal.tsx
• Estimated Time: 10–15 minutes
• Difficulty: Level 1 (Beginner)

Why This Matters

Screen reader users navigating form controls rely on aria-describedby links to connect form input fields directly to their corresponding hint text and input format instructions.

Current Behavior

The goal target input in src/components/goals/goal-form-modal.tsx presents instructional text below the field, but does not connect the input and text via aria-describedby.

Requested Change

1. Assign a unique id to the helper text span in src/components/goals/goal-form-modal.tsx.
2. Add aria-describedby={helperId} to the goal target input element.

Acceptance Criteria

• Unique ID assigned to target input helper text element.
• aria-describedby attribute added to input element referencing the helper ID.
• Verification command succeeds: npm run test:file -- tests/goals-validation.test.ts.

Verification

npm run test:file -- tests/goals-validation.test.ts

Contributor Notes

Accessibility improvement.

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Open src/components/goals/goal-form-modal.tsx and locate the goal target input and its helper text span. Give the helper text a unique ID and connect the input with aria-describedby, then run npm run test:file -- tests/goals-validation.test.ts. Done means the test succeeds and the input references the helper text ID.