fix(slack): map legacy streaming=false to off (openclaw#26020) thanks @chilu18

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: chilu18 <7957943+chilu18@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/commands/doctor-legacy-config.test.ts

@@ -31,4 +31,21 @@ describe("normalizeCompatibilityConfigValues preview streaming aliases", () => {
       "Normalized channels.discord.streaming boolean → enum (partial).",
     ]);
   });
+
+  it("normalizes slack boolean streaming aliases to enum and native streaming", () => {
+    const res = normalizeCompatibilityConfigValues({
+      channels: {
+        slack: {
+          streaming: false,
+        },
+      },
+    });
+
+    expect(res.config.channels?.slack?.streaming).toBe("off");
+    expect(res.config.channels?.slack?.nativeStreaming).toBe(false);
+    expect(res.config.channels?.slack?.streamMode).toBeUndefined();
+    expect(res.changes).toEqual([
+      "Moved channels.slack.streaming (boolean) → channels.slack.nativeStreaming (false).",
+    ]);
+  });
 });

src/config/config.legacy-config-detection.rejects-routing-allowfrom.test.ts

@@ -597,7 +597,7 @@ describe("legacy config detection", () => {
           },
         },
         assert: (config: NonNullable<OpenClawConfig>) => {
-          expect(config.channels?.slack?.streaming).toBe("partial");
+          expect(config.channels?.slack?.streaming).toBe("off");
           expect(config.channels?.slack?.nativeStreaming).toBe(false);
         },
       },

src/config/discord-preview-streaming.ts

@@ -121,9 +121,9 @@ export function resolveSlackStreamingMode(
   if (legacyStreamMode) {
     return mapSlackLegacyDraftStreamModeToStreaming(legacyStreamMode);
   }
-  // Legacy `streaming` was a Slack native-streaming toggle; preview mode stayed replace.
+  // Legacy boolean `streaming` values map to the unified enum.
   if (typeof params.streaming === "boolean") {
-    return "partial";
+    return params.streaming ? "partial" : "off";
   }
   return "partial";
 }

src/slack/stream-mode.test.ts

@@ -40,12 +40,17 @@ describe("resolveSlackStreamingConfig", () => {
     });
   });
 
-  it("moves legacy streaming boolean to native streaming toggle", () => {
+  it("maps legacy streaming booleans to unified mode and native streaming toggle", () => {
     expect(resolveSlackStreamingConfig({ streaming: false })).toEqual({
-      mode: "partial",
+      mode: "off",
       nativeStreaming: false,
       draftMode: "replace",
     });
+    expect(resolveSlackStreamingConfig({ streaming: true })).toEqual({
+      mode: "partial",
+      nativeStreaming: true,
+      draftMode: "replace",
+    });
   });
 
   it("accepts unified enum values directly", () => {