🐛 Fix exercise intensity dropdown selection state

[ebigunso]

Summary

• Fixes exercise intensity dropdown selection reverting in create/edit flows.
• Removes fragile dependency on wrapper-level change handling inside SleepForm by using deterministic sync logic.
• Adds explicit event forwarding (input, change, blur, focus) in Input wrapper for safer parent event handling.
• Adds focused non-E2E regression tests for intensity state synchronization behavior.
• Archives the investigation plan and records lessons learned.

Root cause

• SleepForm reset logic could overwrite user-selected intensity before dirty state was reliably established via wrapper event behavior.

Validation

• cd sleep-ui && npm run check ✅
• npm run test:unit ✅ (54 tests)

Notes

• Follows non-E2E-first validation strategy for this bug scope.

[Copilot]

Pull request overview

This PR fixes a bug where selecting light or hard exercise intensity in the dropdown would revert to the initial value. The fix introduces deterministic state synchronization logic and explicit event forwarding to ensure user selections are preserved while still supporting late initial value updates for untouched fields.

Changes:

• Replaced fragile on:change event handling with a deterministic syncIntensityState utility function that tracks dirty state and previous initial values
• Added explicit event forwarding (input, change, blur, focus) in the Input.svelte wrapper component
• Added focused unit tests validating intensity state synchronization behavior across key scenarios

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sleep-ui/tests/unit/intensity.spec.ts	New test suite covering intensity state sync logic including dirty state tracking and late initial value updates
sleep-ui/src/lib/utils/intensity.ts	New utility module providing deterministic intensity state synchronization logic
sleep-ui/src/lib/components/SleepForm.svelte	Replaced reactive statement with syncIntensityState call and removed wrapper-level on:change handler
sleep-ui/src/lib/components/Input.svelte	Added event dispatcher and explicit event forwarding for safer parent event handling
docs/coding-agent/plans/completed/exercise-intensity-dropdown-investigation-plan.md	Archived investigation plan documenting the bug analysis and fix approach
docs/coding-agent/lessons.md	Added two new lessons learned about research task approval and test layer selection

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