smart context v3 (#1022)

<!-- This is an auto-generated description by cubic. -->

## Summary by cubic
Adds Smart Context v3 with selectable modes (Off, Conservative,
Balanced) and surfaces token savings in chat. Also improves token
estimation by counting per-file tokens when Smart Context is enabled.

- **New Features**
- Smart Context selector in Pro settings with three options.
Conservative is the default when enabled without an explicit choice.
- New setting: proSmartContextOption ("balanced"); undefined implies
Conservative.
- Engine now receives enable_smart_files_context and smart_context_mode.
- Chat shows a DyadTokenSavings card when the message contains
token-savings?original-tokens=...&smart-context-tokens=..., with percent
saved and a tooltip for exact tokens.
- Token estimation uses extracted file contents for accuracy when Pro +
Smart Context is on; otherwise falls back to formatted codebase output.

<!-- End of auto-generated description by cubic. -->

e2e-tests/context_manage.spec.ts

@@ -41,7 +41,7 @@ test("manage context - smart context", async ({ po }) => {
   // Disabling smart context will automatically disable
   // the auto-includes.
   const proModesDialog = await po.openProModesDialog();
-  await proModesDialog.toggleSmartContext();
+  await proModesDialog.setSmartContextMode("off");
   await proModesDialog.close();
 
   await po.sendPrompt("[dump]");

e2e-tests/engine.spec.ts

@@ -2,8 +2,6 @@ import { testSkipIfWindows } from "./helpers/test_helper";
 
 testSkipIfWindows("send message to engine", async ({ po }) => {
   await po.setUpDyadPro();
-  // By default, it's using auto which points to Flash 2.5 and doesn't
-  // use engine.
   await po.selectModel({ provider: "Google", model: "Gemini 2.5 Pro" });
   await po.sendPrompt("[dump] tc=turbo-edits");
 
@@ -11,6 +9,23 @@ testSkipIfWindows("send message to engine", async ({ po }) => {
   await po.snapshotMessages({ replaceDumpPath: true });
 });
 
+testSkipIfWindows(
+  "send message to engine - smart context balanced",
+  async ({ po }) => {
+    await po.setUpDyadPro();
+    const proModesDialog = await po.openProModesDialog({
+      location: "home-chat-input-container",
+    });
+    await proModesDialog.setSmartContextMode("balanced");
+    await proModesDialog.close();
+    await po.selectModel({ provider: "Google", model: "Gemini 2.5 Pro" });
+    await po.sendPrompt("[dump] tc=turbo-edits");
+
+    await po.snapshotServerDump("request");
+    await po.snapshotMessages({ replaceDumpPath: true });
+  },
+);
+
 testSkipIfWindows("send message to engine - openai gpt-4.1", async ({ po }) => {
   await po.setUpDyadPro();
   // By default, it's using auto which points to Flash 2.5 and doesn't
@@ -52,7 +67,7 @@ testSkipIfWindows(
     const proModesDialog = await po.openProModesDialog({
       location: "home-chat-input-container",
     });
-    await proModesDialog.toggleSmartContext();
+    await proModesDialog.setSmartContextMode("off");
     await proModesDialog.close();
     await po.sendPrompt("[dump] tc=turbo-edits");
 

e2e-tests/gateway.spec.ts

@@ -7,7 +7,7 @@ testSkipIfWindows("claude 4 sonnet", async ({ po }) => {
     location: "home-chat-input-container",
   });
   await proModesDialog.toggleTurboEdits();
-  await proModesDialog.toggleSmartContext();
+  await proModesDialog.setSmartContextMode("off");
   await proModesDialog.close();
 
   await po.selectModel({ provider: "Anthropic", model: "Claude 4 Sonnet" });

e2e-tests/helpers/test_helper.ts

@@ -67,8 +67,12 @@ class ProModesDialog {
     public close: () => Promise<void>,
   ) {}
 
-  async toggleSmartContext() {
-    await this.page.getByRole("switch", { name: "Smart Context" }).click();
+  async setSmartContextMode(mode: "balanced" | "off" | "conservative") {
+    await this.page
+      .getByRole("button", {
+        name: mode.charAt(0).toUpperCase() + mode.slice(1),
+      })
+      .click();
   }
 
   async toggleTurboEdits() {

e2e-tests/smart_context_options.spec.ts

@@ -0,0 +1,15 @@
+import { test } from "./helpers/test_helper";
+
+test("switching smart context mode saves the right setting", async ({ po }) => {
+  await po.setUpDyadPro();
+  const proModesDialog = await po.openProModesDialog({
+    location: "home-chat-input-container",
+  });
+  await po.snapshotSettings();
+  await proModesDialog.setSmartContextMode("balanced");
+  await po.snapshotSettings();
+  await proModesDialog.setSmartContextMode("off");
+  await po.snapshotSettings();
+  await proModesDialog.setSmartContextMode("conservative");
+  await po.snapshotSettings();
+});

e2e-tests/snapshots/engine.spec.ts_send-message-to-engine---smart-context-balanced-1.aria.yml

@@ -0,0 +1,6 @@
+- paragraph: "[dump] tc=turbo-edits"
+- paragraph: "[[dyad-dump-path=*]]"
+- img
+- text: less than a minute ago
+- button "Retry":
+  - img

e2e-tests/snapshots/smart_context_options.spec.ts_switching-smart-context-mode-saves-the-right-setting-1.txt

@@ -0,0 +1,28 @@
+{
+  "selectedModel": {
+    "name": "auto",
+    "provider": "auto"
+  },
+  "providerSettings": {
+    "auto": {
+      "apiKey": {
+        "value": "testdyadkey",
+        "encryptionType": "plaintext"
+      }
+    }
+  },
+  "telemetryConsent": "unset",
+  "telemetryUserId": "[UUID]",
+  "hasRunBefore": true,
+  "enableDyadPro": true,
+  "experiments": {},
+  "lastShownReleaseNotesVersion": "[scrubbed]",
+  "enableProLazyEditsMode": true,
+  "enableProSmartFilesContextMode": true,
+  "selectedTemplateId": "react",
+  "selectedChatMode": "build",
+  "enableAutoFixProblems": false,
+  "enableAutoUpdate": true,
+  "releaseChannel": "stable",
+  "isTestMode": true
+}

e2e-tests/snapshots/smart_context_options.spec.ts_switching-smart-context-mode-saves-the-right-setting-2.txt

@@ -0,0 +1,29 @@
+{
+  "selectedModel": {
+    "name": "auto",
+    "provider": "auto"
+  },
+  "providerSettings": {
+    "auto": {
+      "apiKey": {
+        "value": "testdyadkey",
+        "encryptionType": "plaintext"
+      }
+    }
+  },
+  "telemetryConsent": "unset",
+  "telemetryUserId": "[UUID]",
+  "hasRunBefore": true,
+  "enableDyadPro": true,
+  "experiments": {},
+  "lastShownReleaseNotesVersion": "[scrubbed]",
+  "enableProLazyEditsMode": true,
+  "enableProSmartFilesContextMode": true,
+  "proSmartContextOption": "balanced",
+  "selectedTemplateId": "react",
+  "selectedChatMode": "build",
+  "enableAutoFixProblems": false,
+  "enableAutoUpdate": true,
+  "releaseChannel": "stable",
+  "isTestMode": true
+}

e2e-tests/snapshots/smart_context_options.spec.ts_switching-smart-context-mode-saves-the-right-setting-3.txt

@@ -0,0 +1,28 @@
+{
+  "selectedModel": {
+    "name": "auto",
+    "provider": "auto"
+  },
+  "providerSettings": {
+    "auto": {
+      "apiKey": {
+        "value": "testdyadkey",
+        "encryptionType": "plaintext"
+      }
+    }
+  },
+  "telemetryConsent": "unset",
+  "telemetryUserId": "[UUID]",
+  "hasRunBefore": true,
+  "enableDyadPro": true,
+  "experiments": {},
+  "lastShownReleaseNotesVersion": "[scrubbed]",
+  "enableProLazyEditsMode": true,
+  "enableProSmartFilesContextMode": false,
+  "selectedTemplateId": "react",
+  "selectedChatMode": "build",
+  "enableAutoFixProblems": false,
+  "enableAutoUpdate": true,
+  "releaseChannel": "stable",
+  "isTestMode": true
+}

e2e-tests/snapshots/smart_context_options.spec.ts_switching-smart-context-mode-saves-the-right-setting-4.txt

@@ -0,0 +1,28 @@
+{
+  "selectedModel": {
+    "name": "auto",
+    "provider": "auto"
+  },
+  "providerSettings": {
+    "auto": {
+      "apiKey": {
+        "value": "testdyadkey",
+        "encryptionType": "plaintext"
+      }
+    }
+  },
+  "telemetryConsent": "unset",
+  "telemetryUserId": "[UUID]",
+  "hasRunBefore": true,
+  "enableDyadPro": true,
+  "experiments": {},
+  "lastShownReleaseNotesVersion": "[scrubbed]",
+  "enableProLazyEditsMode": true,
+  "enableProSmartFilesContextMode": true,
+  "selectedTemplateId": "react",
+  "selectedChatMode": "build",
+  "enableAutoFixProblems": false,
+  "enableAutoUpdate": true,
+  "releaseChannel": "stable",
+  "isTestMode": true
+}