feat(keyboard): unify assistant voice and AI workflows

Merge dictation and AI controls into one assistant surface, preserve safe insertion and clipboard actions, and align settings and tests with the new flow.

OSGKeyboardShared/Services/KeyboardState.swift

@@ -134,8 +134,6 @@ public final class KeyboardState: ObservableObject {
     /// Mirrors the host field's return-key intent. The action stays a newline
     /// insert; host apps decide whether that submits or creates a line break.
     @Published public var returnKeyRole: ReturnKeyRole = .newline
-    /// Press-and-drag pads beside the mic for four-way caret movement.
-    @Published public var cursorDragNavigationEnabled: Bool = true
     /// Opt-in clipboard history capture (mirrored from App Group).
     @Published public var clipboardHistoryEnabled: Bool = false
     /// Opt-in clipboard suggestion strip (requires history enabled).
@@ -174,12 +172,11 @@ public final class KeyboardState: ObservableObject {
     /// constraint and the SwiftUI key grid pick their metrics from this one
     /// value so they can never disagree and clip the bottom row.
     @Published public var layoutWidth: CGFloat = 0
-    /// `true` while a cursor-drag pad is being pressed — drives the hint
-    /// shown above the mic.
-    @Published public var cursorDragActive: Bool = false
     /// `true` when the last voice insertion is still at the caret and can
     /// be undone (suffix-checked against `documentContextBeforeInput`).
     @Published public var undoAvailable: Bool = false
+    /// A verified OSG-generated insertion can be edited by voice.
+    @Published public var editAvailable: Bool = false
     /// `true` while an undone voice insertion can be re-applied (redo buffer).
     @Published public var redoAvailable: Bool = false
     /// `true` when the host field has a non-empty selection (copy enabled).
@@ -190,6 +187,11 @@ public final class KeyboardState: ObservableObject {
     @Published public var editSession: EditSessionState = .inactive
     /// AI conversation UI state for the keyboard surface. The host owns the actual messages.
     @Published public var aiSession: AISessionState = .inactive
+    /// The latest generated insertion can be submitted through the host's
+    /// action-style Return key (Send / Search / Done / Go).
+    @Published public var assistantSendAvailable: Bool = false
+    /// Brief success pulse rendered on the unified assistant microphone.
+    @Published public var assistantInsertionSucceeded: Bool = false
     @Published public var editCanReplaceOriginal: Bool = false
     /// Short idle feedback (availability, expiry, missing LLM).
     @Published public var editHint: String?
@@ -210,6 +212,7 @@ public final class KeyboardState: ObservableObject {
         clipboardSuggestionText = nil
         clipboardSuggestionChangeCount = nil
         clipboardOverlay = .none
+        assistantSendAvailable = false
     }
 
     // MARK: - Host-app onboarding gate
@@ -270,7 +273,11 @@ public final class KeyboardState: ObservableObject {
     public var closeEditMode: () -> Void = {}
     public var tapAIMic: () -> Void = {}
     public var cancelAIInput: () -> Void = {}
-    public var sendAIAnswer: () -> Void = {}
+    /// Explicitly inserts a retained AI result after target validation failed.
+    public var confirmPendingAIAnswer: () -> Void = {}
+    public var discardPendingAIAnswer: () -> Void = {}
+    /// Performs the host's action-style Return after generated text was inserted.
+    public var sendAssistantAction: () -> Void = {}
     /// Sends a tapped idle hint card as the AI question (skip microphone).
     public var submitAIHint: (AIHintCard) -> Void = { _ in }
     /// Sends a clipboard skill (reply / summarize / translate / export).
@@ -315,11 +322,6 @@ public final class KeyboardState: ObservableObject {
     public var copySelection:       () -> Void = {}
     /// Cut the current text selection (copy + delete).
     public var cutSelection:        () -> Void = {}
-    public var moveCursorHorizontal: (Int) -> Void = { _ in }
-    public var moveCursorVertical:   (Int) -> Void = { _ in }
-    /// Cursor-drag pad press lifecycle — updates `cursorDragActive` and
-    /// lets the view controller reset vertical-navigation stickiness.
-    public var setCursorDragActive:  (Bool) -> Void = { _ in }
     /// Switch voice ↔ typing. No-ops when voice pipeline is active.
     public var setSurface: (Surface) -> Void = { _ in }
 
@@ -338,7 +340,7 @@ public final class KeyboardState: ObservableObject {
     public var canEnterTypingSurface: Bool { !locksTypingSurface }
 
     public var canCancelAIInput: Bool {
-        surface == .ai && aiSession.isBusy
+        aiSession.isBusy
     }
 
     /// Normal dictation can be discarded from microphone startup through