iOS: support canvas.a2ui push/reset

apps/ios/Sources/Bridge/BridgeConnectionController.swift

@@ -179,6 +179,8 @@ final class BridgeConnectionController {
             ClawdisCanvasCommand.navigate.rawValue,
             ClawdisCanvasCommand.evalJS.rawValue,
             ClawdisCanvasCommand.snapshot.rawValue,
+            ClawdisCanvasA2UICommand.push.rawValue,
+            ClawdisCanvasA2UICommand.reset.rawValue,
         ]
 
         let caps = Set(self.currentCaps())

apps/ios/Sources/Model/NodeAppModel.swift

@@ -316,6 +316,56 @@ final class NodeAppModel {
                 let payload = try Self.encodePayload(["format": "png", "base64": base64])
                 return BridgeInvokeResponse(id: req.id, ok: true, payloadJSON: payload)
 
+            case ClawdisCanvasA2UICommand.reset.rawValue:
+                try self.screen.showA2UI()
+                if await !self.screen.waitForA2UIReady(timeoutMs: 5000) {
+                    return BridgeInvokeResponse(
+                        id: req.id,
+                        ok: false,
+                        error: ClawdisNodeError(code: .unavailable, message: "A2UI not ready"))
+                }
+
+                let json = try await self.screen.eval(javaScript: """
+                (() => {
+                  if (!globalThis.clawdisA2UI) return JSON.stringify({ ok: false, error: "missing clawdisA2UI" });
+                  return JSON.stringify(globalThis.clawdisA2UI.reset());
+                })()
+                """)
+                return BridgeInvokeResponse(id: req.id, ok: true, payloadJSON: json)
+
+            case ClawdisCanvasA2UICommand.push.rawValue, ClawdisCanvasA2UICommand.pushJSONL.rawValue:
+                let messages: [AnyCodable]
+                if command == ClawdisCanvasA2UICommand.pushJSONL.rawValue {
+                    let params = try Self.decodeParams(ClawdisCanvasA2UIPushJSONLParams.self, from: req.paramsJSON)
+                    messages = try ClawdisCanvasA2UIJSONL.decodeMessagesFromJSONL(params.jsonl)
+                } else {
+                    let params = try Self.decodeParams(ClawdisCanvasA2UIPushParams.self, from: req.paramsJSON)
+                    messages = params.messages
+                }
+
+                try self.screen.showA2UI()
+                if await !self.screen.waitForA2UIReady(timeoutMs: 5000) {
+                    return BridgeInvokeResponse(
+                        id: req.id,
+                        ok: false,
+                        error: ClawdisNodeError(code: .unavailable, message: "A2UI not ready"))
+                }
+
+                let messagesJSON = try ClawdisCanvasA2UIJSONL.encodeMessagesJSONArray(messages)
+                let js = """
+                (() => {
+                  try {
+                    if (!globalThis.clawdisA2UI) return JSON.stringify({ ok: false, error: "missing clawdisA2UI" });
+                    const messages = \(messagesJSON);
+                    return JSON.stringify(globalThis.clawdisA2UI.applyMessages(messages));
+                  } catch (e) {
+                    return JSON.stringify({ ok: false, error: String(e?.message ?? e) });
+                  }
+                })()
+                """
+                let resultJSON = try await self.screen.eval(javaScript: js)
+                return BridgeInvokeResponse(id: req.id, ok: true, payloadJSON: resultJSON)
+
             case ClawdisCameraCommand.snap.rawValue:
                 let params = (try? Self.decodeParams(ClawdisCameraSnapParams.self, from: req.paramsJSON)) ??
                     ClawdisCameraSnapParams()

apps/ios/Sources/Screen/ScreenController.swift

@@ -43,19 +43,64 @@ final class ScreenController {
 
     func navigate(to urlString: String) {
         self.urlString = urlString
+        if !urlString.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+            // `canvas.navigate` is expected to show web content; default to WEB mode.
+            self.mode = .web
+        }
         self.reload()
     }
 
     func reload() {
         switch self.mode {
         case .web:
-            guard let url = URL(string: self.urlString.trimmingCharacters(in: .whitespacesAndNewlines)) else { return }
+            let trimmed = self.urlString.trimmingCharacters(in: .whitespacesAndNewlines)
-            self.webView.load(URLRequest(url: url))
+            guard let url = URL(string: trimmed) else { return }
+            if url.isFileURL {
+                self.webView.loadFileURL(url, allowingReadAccessTo: url.deletingLastPathComponent())
+            } else {
+                self.webView.load(URLRequest(url: url))
+            }
         case .canvas:
             self.webView.loadHTMLString(Self.canvasScaffoldHTML, baseURL: nil)
         }
     }
 
+    func showA2UI() throws {
+        guard let url = ClawdisKitResources.bundle.url(
+            forResource: "index",
+            withExtension: "html",
+            subdirectory: "CanvasA2UI")
+        else {
+            throw NSError(domain: "Canvas", code: 10, userInfo: [
+                NSLocalizedDescriptionKey: "A2UI resources missing (CanvasA2UI/index.html)",
+            ])
+        }
+        self.mode = .web
+        self.urlString = url.absoluteString
+        self.reload()
+    }
+
+    func waitForA2UIReady(timeoutMs: Int) async -> Bool {
+        let clock = ContinuousClock()
+        let deadline = clock.now.advanced(by: .milliseconds(timeoutMs))
+        while clock.now < deadline {
+            do {
+                let res = try await self.eval(javaScript: """
+                (() => {
+                  try {
+                    return !!globalThis.clawdisA2UI && typeof globalThis.clawdisA2UI.applyMessages === 'function';
+                  } catch (_) { return false; }
+                })()
+                """)
+                if res == "true" { return true }
+            } catch {
+                // ignore; page likely still loading
+            }
+            try? await Task.sleep(nanoseconds: 120_000_000)
+        }
+        return false
+    }
+
     func eval(javaScript: String) async throws -> String {
         try await withCheckedThrowingContinuation { cont in
             self.webView.evaluateJavaScript(javaScript) { result, error in

apps/ios/Sources/Settings/SettingsTab.swift

@@ -305,6 +305,8 @@ struct SettingsTab: View {
             ClawdisCanvasCommand.navigate.rawValue,
             ClawdisCanvasCommand.evalJS.rawValue,
             ClawdisCanvasCommand.snapshot.rawValue,
+            ClawdisCanvasA2UICommand.push.rawValue,
+            ClawdisCanvasA2UICommand.reset.rawValue,
         ]
 
         let caps = Set(self.currentCaps())

apps/ios/Tests/ScreenControllerTests.swift

@@ -17,10 +17,9 @@ import WebKit
         #expect(scrollView.bounces == false)
     }
 
-    @Test @MainActor func webModeRejectsInvalidURLStrings() {
+    @Test @MainActor func navigateDefaultsToWebMode() {
         let screen = ScreenController()
-        screen.navigate(to: "about:blank")
+        screen.navigate(to: "not a url")
-        screen.setMode(.web)
 
         #expect(screen.mode == .web)
     }

docs/ios/spec.md

@@ -119,10 +119,14 @@ Add to `src/gateway/protocol/schema.ts` (and regenerate Swift models):
 ### Node command set (canvas)
 These are values for `node.invoke.command`:
 - `canvas.show` / `canvas.hide`
-- `canvas.navigate` with `{ url }` (Canvas URL or https URL)
+- `canvas.navigate` with `{ url }` (Canvas URL or https URL; switches mode to `"web"`)
 - `canvas.eval` with `{ javaScript }`
 - `canvas.snapshot` with `{ maxWidth?, quality?, format? }`
-- `canvas.setMode` with `{ mode: "canvas" | "web" }`
+- `canvas.setMode` with `{ mode: "canvas" | "web" }` (use `"canvas"` to return to the scaffold)
+- A2UI (mobile + macOS canvas):
+  - `canvas.a2ui.push` with `{ messages: [...] }` (A2UI v0.8 server→client messages)
+  - `canvas.a2ui.pushJSONL` with `{ jsonl: "..." }` (legacy alias)
+  - `canvas.a2ui.reset`
 
 Result pattern:
 - Request is a standard `req/res` with `ok` / `error`.