fix(assistant): unify tool rendering and stack detail fields

Use generic MCP result rendering and place labels above values on macOS and iOS. Update existing presentation expectations.

Co-Authored-By: Claude Code <noreply@anthropic.com>

Frameworks/TermindPresentation/AssistantToolDetails.swift

@@ -38,7 +38,7 @@ public struct AssistantToolDetails: View {
     @ViewBuilder private func item(_ value: AgentToolDetail.Item) -> some View {
         switch value {
         case .field(let field):
-            HStack(alignment: .firstTextBaseline, spacing: 8) {
+            VStack(alignment: .leading, spacing: 4) {
                 Text(field.label).font(.caption.weight(.medium)).foregroundStyle(.secondary)
                 if !field.value.isEmpty {
                     if let navigation = field.navigation, let navigate {
@@ -54,6 +54,8 @@ public struct AssistantToolDetails: View {
                     }
                 }
             }
+            .frame(maxWidth: .infinity, alignment: .leading)
+            .fixedSize(horizontal: false, vertical: true)
         case .message(let text, let tint): Text(text).foregroundStyle(color(tint))
         case .text(let block):
             if let title = block.title { Text(title).font(.caption.weight(.medium)).foregroundStyle(.secondary) }

Frameworks/TermindPresentation/TermindToolPresentationProfiles.swift

@@ -24,9 +24,7 @@ nonisolated public enum TermindToolPresentationProfiles {
 
     public static func profile(for descriptor: AgentToolDescriptor) -> AgentToolPresentationProfile {
         if descriptor.target == .mcp {
-            var profile = AgentToolPresentationProfile()
-            profile.preservesUnprojectedJSON = true
-            return profile
+            return .init()
         }
         // Privacy is independent of presenter availability; it is not semantic recovery.
         if descriptor.target == .local,

TFM/Features/AI/TranscriptNativeRows.swift

@@ -1545,14 +1545,13 @@ private enum NativeTranscriptFactory {
     ) -> NSView {
         switch item {
         case .field(let field):
-            let row = NativeStack.horizontal(spacing: Metrics.Space.s)
+            let row = NativeStack.vertical(spacing: Metrics.Space.xs)
             let key = NativeLabel(
                 field.label,
                 font: .systemFont(ofSize: NSFont.smallSystemFontSize, weight: .medium),
                 color: .secondaryLabelColor
             )
             if field.value.isEmpty { return key }
-            key.widthAnchor.constraint(greaterThanOrEqualToConstant: 76).isActive = true
             row.addArrangedSubview(key)
             let font: NSFont =
                 field.isMonospaced

TFMTests/AgentToolPresentationProfileTests.swift

@@ -82,7 +82,7 @@ struct AgentToolPresentationProfileTests {
         #expect(detail.layout.singleLineHeader)
         let fallback = try #require(TermindToolPresentationProfiles.renderer.detail(for: card))
         #expect(fallback.items != detail.items)
-        #expect(AgentToolDetailPreview(fallback).fullText.contains("\"value\""))
+        #expect(fallback.items == [.field(.init(label: "Value", value: "42"))])
     }
 
     @Test

TFMTests/AgentToolPresentationTests.swift

@@ -280,7 +280,7 @@ struct AgentToolPresentationTests {
     }
 
     @Test
-    func builtInFallbackUsesFieldsWhileMCPKeepsJSON() throws {
+    func builtInAndMCPFallbackUseTheSameFields() throws {
         let payload = AgentJSONValue.object([
             "internal_flag": .bool(true), "count": .number(2),
         ]).encodedString
@@ -306,12 +306,7 @@ struct AgentToolPresentationTests {
         let mcpDetail = try #require(
             TermindToolPresentationProfiles.renderer.detail(
                 for: mcp, presenter: AppDependencies.toolPresenter(for: mcp.descriptor)))
-        guard case .text(let block) = try #require(mcpDetail.items.first) else {
-            Issue.record("Expected MCP JSON text")
-            return
-        }
-        #expect(block.text.contains("{"))
-        #expect(block.text.contains("\"internal_flag\""))
+        #expect(mcpDetail.items == builtInDetail.items)
     }
 
     @Test