[obvious-fleet] fix(ios): make Not-this-item on ingredient review never a silent no-op

[obvious-autobuild]

fleet-packet: burst6-cont-fridgeluck-36

What changed and why

Continuation of this PR's original change: "Not this item" on a needs-confirmation ingredient-review row was a silent no-op when no candidate was selected (first run, empty learning cache). It now always produces a visible state change:

• clearSelection routes through a new pure state transition, IngredientReviewView.notThisItemOutcome(detection:selectedIngredientId:suggestedIngredientId:), which (a) removes a previously selected suggestion from the confirmed set, (b) clears the selection entry, (c) rejects the row (rejectedDetectionIds), and (d) records the learning outcome for a shown suggestion (unchanged telemetry semantics).
• Rejected rows leave every review-screen aggregate: the needs-confirmation list/count, unresolvedCount, confirmationCompletion, the divider between sections, and the confidence-health pill ("All clear" once nothing is left).
• The Yes / Not-this-item buttons get 44pt minimum tap targets, contentShape(Rectangle()), and accessibilityIdentifier("ingredient_review_not_this_item").
• New apps/ios/Tests/IngredientReviewNotThisItemTests.swift covers the pure transition: first-run no-selection (previously the dead-tap case), selected-suggestion rejection, and suggestion-matches-vision-label counting as accepted.

Port onto alpha. The original base feat/minimal-product-20261007 is stale against the current integration branch alpha (69 alpha commits since merge-base 8c9c88f; alpha tip 0309dd1). The change is ported by merging origin/alpha into obv/fridgeluck-046 as merge commit 5cfb966 — chosen over rebase so the evidence commits 31a4819 and ebb6047 keep their hashes and the earlier CI runs on them stay attributable. The merge had zero conflicts. The PR base was retargeted from feat/minimal-product-20261007 to alpha.

How I verified it (commands and results)

• git merge origin/alpha --no-ff → zero conflicts; merge commit 5cfb966 with parents ebb6047 + 0309dd1.
• git diff --stat origin/alpha..HEAD → exactly 3 files, +130/−10 (IngredientReviewSections.swift +5, IngredientReviewView.swift +67/−10, Tests/IngredientReviewNotThisItemTests.swift +68): the merged head is alpha plus only this change.
• git diff --stat ebb6047..HEAD → 160 files, +17147/−677, all alpha-side; none of this PR's files are touched.
• grep on the merged IngredientReviewView.swift: alpha's location: .inferredFromIngredient call-site change (line 71) coexists with rejectedDetectionIds (line 96), reviewableNeedsConfirmation (line 493), and notThisItemOutcome (lines 695/733).
• swift-frontend -parse (Swift 6.1.2, Linux) on the three touched files → no parse errors.
• swift test --package-path apps/ios (Linux) → compilation of FLFeatureLogic fails at LiveAssistantPanelLayout.swift:1:8: error: no such module 'CoreGraphics'. This is a pre-existing limitation of the package on Linux (CoreGraphics/SwiftUI are Apple-only), not something this branch introduced; the repo's own iOS tests are xcodebuild test against the generated Xcode project and cannot run in this sandbox.
• Read-level consistency check: the three XCTest cases' expected values match the pure function's contract exactly ((nil, nil) → reject only; (5, 5) vs ingredient 7 → reject + clear + recorded false; (9, 9) → recorded true).
• Hosted macOS CI (the repository's own check) on merged head 5cfb966, run https://github.com/SamGu-NRX/FridgeLuck/actions/runs/38755647018: build-and-test pass (6m52s), dead-code-advisory pass (2m44s), CodeRabbit pass.

What is not verified

• No Xcode / iOS 26 simulator in this sandbox, so the new XCTests (IngredientReviewNotThisItemTests) were not executed locally; they run in the hosted build-and-test job. Everything else about the SwiftUI behavior (44pt targets, contentShape, VoiceOver identifier) also rests on that job — no device run was possible.
• Nothing was verified in a real app run: no manual exercise of the review screen, and the visual/interaction change has no device evidence.

Assumptions

• "Port onto alpha" includes retargeting this PR's base to alpha (matching fleet PRs feat(ios): add label-numbers evaluation corpus with checker and parser replay #55 and feat(benchmarks): dish-ambiguity-v1 — taxonomy, manifests, and evaluated classifier pins #57); the task's --base feat/minimal-product-20261007 create-command applies only when no PR exists, and PR [obvious-fleet] fix(ios): make Not-this-item on ingredient review never a silent no-op #36 existed, so it was updated in place instead.
• Merge-not-rebase was chosen deliberately to preserve the earlier attempt's evidence hashes; the head this PR's original CI ran on (ebb6047) is still reachable as the first parent of 5cfb966.
• Title already matched the required [obvious-fleet] + summary format, so it was kept; the PR remains a draft.
• The task's sandbox note said not to switch modes, but the explicit first-step instruction asked for the switch card, which the user approved mid-run; work continued in Autobuild after that.

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[obvious-autobuild]

Independent review (Obvious, Autobuild + Max)

Verdict: ready. Two low-severity findings below, neither a merge blocker. Disclosure for context: this review comes from the same automation fleet that authored the PR; every claim below was re-derived from the repo and CI logs, not taken from the PR body.

What I verified (commands and results)

• Read the full diff, all comments/reviews, and AGENTS.md (no CLAUDE.md/CONTRIBUTING exists). Diff is exactly 3 files, +130/−10, no drive-by changes; clearSelection has exactly one caller (onClear from the needs-confirmation section), so the new rejection semantics can't leak into other sections.
• Port structure: head 5cfb966 = merge of ebb6047 + 0309dd1 (origin/alpha); git diff --stat origin/alpha..HEAD = the PR's 3 files only. Matches the body.
• CI: run 38755647018 ran on headSha 5cfb966de… — build-and-test pass (6m52s), dead-code-advisory pass (2m44s), CodeRabbit pass. gh run view --job=116493221581 --log shows all three new tests actually executed and passed on macOS (Test Suite 'IngredientReviewNotThisItemTests' passed; Test Suite 'All tests' passed).
• Core behavior on Linux Swift 6.4: extracted the pure transition verbatim from the PR head into a standalone harness (with a mirror of Detection), replayed the three test cases' assertions → 11/11 checks pass.
• Fail-without-change: the new tests target a new API and can't compile against the base, so I ran the equivalent check — extracted the pre-change clearSelection from origin/alpha (git show 0309dd1:…) and modeled its observable state change. On the first-run case (no selection, no suggestion) the old code mutated nothing (nothing removed, removeValue on a missing key, no rejection state, nothing recorded) — the reported dead tap is real, and the new first-run outcome differs from it, so testNotThisItemRejectsARowEvenWhenNothingIsSelected discriminates old from new.
• Premise check: selectedIngredient(for:) is a bare selectedIngredientForDetection[detection.id] lookup with no fallback, so the transition's inputs are identical to what the old code read — no behavior change for the already-working paths.
• Save-path safety: findRecipes ingests detections + confirmedIds + selectedIngredientForDetection; a rejected row is in none of them, so "rejection is purely review-screen state" holds. Learning telemetry semantics are unchanged (suggestion == detection.ingredientId, only when a suggestion was shown).
• Linux swift test --package-path apps/ios fails at FeatureLogic/Assistant/LiveAssistantPanelLayout.swift:1:8: no such module 'CoreGraphics' — reproduced, pre-existing, matches the body.

Findings (ranked)

1. Low — one divider still keys on the unfiltered list — apps/ios/Feature/Ingredients/IngredientReviewView.swift:206: the divider between AUTO-DETECTED and NEEDS-CONFIRMATION uses !categorized.needsConfirmation.isEmpty, while the NEEDS-CONFIRMATION↔MAYBE divider (line 234) correctly uses reviewableNeedsConfirmation. After rejecting every row the section renders nothing (its body guards if !detections.isEmpty) but this divider survives — visible when there are auto-detected items and no MAYBE items (stray trailing divider). This also makes the body's "Rejected rows leave every review-screen aggregate: … the divider between sections" claim half-true: only one of the two dividers was switched. Smallest fix: use reviewableNeedsConfirmation in the line-206 condition too.
2. Low — rejection has no in-session undo, and "Clear" doesn't restore rows — clearUncertainSelections (IngredientReviewView.swift:644, toolbar button at line 590) resets selections but not rejectedDetectionIds, so a rejected row can never come back without leaving the screen. Defensible as designed (rejection ≈ dismissal), but if that toolbar action is meant to be a full reset, add rejectedDetectionIds.removeAll() there. Not a regression — base had no rejection at all.

Informational, not a finding: didClearSelection/didRejectDetection are constants (true) in NotThisItemOutcome, so the two call-site guards and the corresponding test assertions can't fail. Harmless; the varying fields (removedConfirmedIngredientId, recordedSuggestedOutcome) are well covered by the three tests.

What I couldn't verify

• No Xcode/iOS simulator here: no local run of the app or the new XCTests (they ran on hosted macOS CI, above), and no device/VoiceOver check of the 44pt targets, contentShape, or the accessibility identifier — all UI-touching behavior rests on CI plus code reading.
• No visual evidence either way: I did not capture before/after screenshots of the review screen; CI is the only behavioral check the change has beyond the unit tests.

Nothing blocking: the fix does what it claims, the tests exercise the real path and fail against the old behavior, and the scope is right.