fix: allow selecting "Don't import" for lab result groups

[bisonbet]

Motivation

• The import review UI previously used an optional selectedIds dictionary to represent an explicit "Don't import" choice, which could drop or misrepresent the user intent to skip a group.
• Users need the ability to explicitly skip importing a lab result when none of the candidate options are acceptable.

Description

• Changed selection model in BloodTestImportReviewView by replacing the optional-mapped state with selectedIds: [UUID: UUID] and adding ignoredGroupIds: Set<UUID> to track explicit skip choices.
• Hydrated state in onAppear so groups without a selectedCandidateId are added to ignoredGroupIds and header UI shows "Will Ignore" for skipped groups.
• Made the "Don't import this result" row write to ignoredGroupIds and clear the bound group's selectedCandidateId, and updated candidate taps to clear the ignored state when a valid candidate is chosen.
• Updated acceptSelected() to respect ignoredGroupIds by setting selectedCandidateId = nil for ignored groups and updated acceptAllRecommended() to clear ignore flags for groups it auto-selects. (File: HealthApp/HealthApp/Views/BloodTestImportReviewView.swift)

Testing

• No automated unit/UI tests were executed in this rollout; no xcodebuild or XCTest runs were requested per project guidelines.
• Verified code changes were staged and committed locally (git status and commit) and the updated file compiles syntactically in-editor (runtime validation not performed).

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Codex Task

[bisonbet]

@claude please review this PR

[claude]

Claude encountered an error after 0s —— View job

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I'll analyze this and get back to you.