feat(chat): numbered shortcuts on permission sheet (Phase 2.3)

Hermes v2026.4.23's TUI rewrite added 1-9 numbered shortcuts on
approval prompts so power users approve/deny without reaching for
the mouse. Mirror the pattern in Scarf:

Mac PermissionApprovalView:
- Each option button gets a "1. ", "2. ", … prefix on its label.
- New private View extension `applyingNumberShortcut(index:)` binds
  the digit `idx + 1` (no modifiers) via .keyboardShortcut. Capped
  at 9; extra options stay tappable but unbound.

iOS PermissionSheet:
- Each row gets a monospaced "1." / "2." prefix as a hierarchy hint.
- No keyboard binding (phones don't have hardware keyboards), but
  the numbering matches the Mac pattern so users transitioning
  between platforms see the same visual structure.

Verified: Mac + iOS builds clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scarf/Scarf iOS/Chat/ChatView.swift

@@ -1270,7 +1270,12 @@ private struct PermissionSheet: View {
                 }
 
                 Section("Your response") {
-                    ForEach(permission.options, id: \.optionId) { opt in
+                    // Visual numbering 1-9 matches the Mac sheet's
+                    // keyboard shortcuts; on iPhone the numbers serve
+                    // as a hierarchy hint rather than an accelerator
+                    // (no hardware keyboard binding). Mirrors the new
+                    // Hermes v2026.4.23 TUI pattern.
+                    ForEach(Array(permission.options.enumerated()), id: \.element.optionId) { idx, opt in
                         Button {
                             Task {
                                 await onRespond(opt.optionId)
@@ -1278,6 +1283,11 @@ private struct PermissionSheet: View {
                             }
                         } label: {
                             HStack {
+                                if idx < 9 {
+                                    Text("\(idx + 1).")
+                                        .font(.body.monospaced())
+                                        .foregroundStyle(.secondary)
+                                }
                                 Text(opt.name)
                                 Spacer()
                                 Image(systemName: "chevron.right")

scarf/scarf/Features/Chat/Views/ChatView.swift

@@ -444,22 +444,34 @@ struct PermissionApprovalView: View {
                 .multilineTextAlignment(.center)
                 .padding(.horizontal)
 
+            // Numbered keyboard shortcuts (1–9) on the option buttons.
+            // Mirrors the new TUI pattern Hermes v2026.4.23 ships —
+            // power users approve / deny without reaching for the
+            // mouse. Visible "1." prefixes act as discoverability
+            // hints; the actual key binding goes through
+            // `.keyboardShortcut`. Capped at 9 — extra options stay
+            // tappable but unbound (they'd need modifiers to
+            // disambiguate beyond 9, which isn't worth it).
             HStack(spacing: 12) {
-                ForEach(options, id: \.optionId) { option in
+                ForEach(Array(options.enumerated()), id: \.element.optionId) { idx, option in
+                    let label = idx < 9 ? "\(idx + 1). \(option.name)" : option.name
+                    Group {
                         if option.optionId == "deny" {
-                        Button(option.name) {
+                            Button(label) {
                                 onRespond(option.optionId)
                                 dismiss()
                             }
                             .buttonStyle(.bordered)
                         } else {
-                        Button(option.name) {
+                            Button(label) {
                                 onRespond(option.optionId)
                                 dismiss()
                             }
                             .buttonStyle(.borderedProminent)
                         }
                     }
+                    .applyingNumberShortcut(index: idx)
+                }
             }
         }
         .padding(24)
@@ -484,3 +496,17 @@ struct PermissionApprovalView: View {
         }
     }
 }
+
+private extension View {
+    /// Bind the digit `idx + 1` (1-9) to this view as a no-modifier
+    /// keyboard shortcut. Indices ≥ 9 silently skip — there are only
+    /// nine numeric shortcut keys without modifier conflicts.
+    @ViewBuilder
+    func applyingNumberShortcut(index idx: Int) -> some View {
+        if idx < 9, let scalar = Unicode.Scalar(48 + idx + 1) {
+            self.keyboardShortcut(KeyEquivalent(Character(scalar)), modifiers: [])
+        } else {
+            self
+        }
+    }
+}