feat: show Altimate in Popular providers with 3-step login flow

- Add `altimate-backend` to `PROVIDER_PRIORITY` so it appears in the
  Popular category of the "Connect a provider" dialog
- Custom `onSelect` launches the login wizard instead of the generic
  API key prompt
- Reorder wizard steps to: Instance Name → API Key → URL (with default)
- No model selection after login — auto-selects Altimate AI

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: suryaiyer95

packages/opencode/src/cli/cmd/tui/component/dialog-altimate-login.tsx

@@ -14,51 +14,35 @@ export function DialogAltimateLogin() {
   const sync = useSync()
   const local = useLocal()
   const { theme } = useTheme()
-  const [step, setStep] = createSignal<"url" | "tenant" | "key">("url")
-  const [url, setUrl] = createSignal("https://api.myaltimate.com")
-  const [tenant, setTenant] = createSignal("")
+  const [step, setStep] = createSignal<"instance" | "key" | "url">("instance")
+  const [instanceName, setInstanceName] = createSignal("")
+  const [apiKey, setApiKey] = createSignal("")
 
-  async function saveAndConnect(apiKey: string) {
+  async function saveAndConnect(url: string) {
     const creds = {
-      altimateUrl: url(),
-      altimateInstanceName: tenant(),
-      altimateApiKey: apiKey,
+      altimateUrl: url,
+      altimateInstanceName: instanceName(),
+      altimateApiKey: apiKey(),
     }
     await Filesystem.writeJson(AltimateApi.credentialsPath(), creds, 0o600)
-    // Refresh providers to pick up the new altimate-backend
     await sdk.client.instance.dispose()
     await sync.bootstrap()
-    // Auto-select the altimate model
     local.model.set({ providerID: "altimate-backend", modelID: "altimate-default" }, { recent: true })
     dialog.clear()
   }
 
   return (
     <>
-      {step() === "url" && (
-        <DialogPrompt
-          title="Altimate URL"
-          placeholder="https://api.myaltimate.com"
-          value="https://api.myaltimate.com"
-          description={() => (
-            <text fg={theme.textMuted}>Enter your Altimate server URL</text>
-          )}
-          onConfirm={(value) => {
-            if (value) setUrl(value)
-            setStep("tenant")
-          }}
-        />
-      )}
-      {step() === "tenant" && (
+      {step() === "instance" && (
         <DialogPrompt
           title="Instance Name"
-          placeholder="your-tenant"
+          placeholder="your-instance"
           description={() => (
             <text fg={theme.textMuted}>Enter your Altimate instance (tenant) name</text>
           )}
           onConfirm={(value) => {
             if (!value) return
-            setTenant(value)
+            setInstanceName(value)
             setStep("key")
           }}
         />
@@ -70,6 +54,21 @@ export function DialogAltimateLogin() {
           description={() => (
             <text fg={theme.textMuted}>Enter your Altimate API key</text>
           )}
+          onConfirm={(value) => {
+            if (!value) return
+            setApiKey(value)
+            setStep("url")
+          }}
+        />
+      )}
+      {step() === "url" && (
+        <DialogPrompt
+          title="Altimate URL"
+          placeholder="https://api.myaltimate.com"
+          value="https://api.myaltimate.com"
+          description={() => (
+            <text fg={theme.textMuted}>Enter your Altimate server URL</text>
+          )}
           onConfirm={async (value) => {
             if (!value) return
             await saveAndConnect(value)

packages/opencode/src/cli/cmd/tui/component/dialog-provider.tsx

@@ -13,14 +13,16 @@ import { DialogModel } from "./dialog-model"
 import { useKeyboard } from "@opentui/solid"
 import { Clipboard } from "@tui/util/clipboard"
 import { useToast } from "../ui/toast"
+import { DialogAltimateLogin } from "./dialog-altimate-login"
 
 const PROVIDER_PRIORITY: Record<string, number> = {
-  opencode: 0,
-  "opencode-go": 1,
-  openai: 2,
-  "github-copilot": 3,
-  anthropic: 4,
-  google: 5,
+  "altimate-backend": 0,
+  opencode: 1,
+  "opencode-go": 2,
+  openai: 3,
+  "github-copilot": 4,
+  anthropic: 5,
+  google: 6,
 }
 
 export function createDialogProviderOptions() {
@@ -35,13 +37,18 @@ export function createDialogProviderOptions() {
         title: provider.name,
         value: provider.id,
         description: {
+          "altimate-backend": "(Instance + API key)",
           opencode: "(Recommended)",
           anthropic: "(API key)",
           openai: "(ChatGPT Plus/Pro or API key)",
           "opencode-go": "Low cost subscription for everyone",
         }[provider.id],
         category: provider.id in PROVIDER_PRIORITY ? "Popular" : "Other",
         async onSelect() {
+          if (provider.id === "altimate-backend") {
+            dialog.replace(() => <DialogAltimateLogin />)
+            return
+          }
           const methods = sync.data.provider_auth[provider.id] ?? [
             {
               type: "api",