feat(mobile): Containr companion app — Expo/RN thin client

Phone app v1 (Phase I): PAT auth against any instance, secure-store
credentials, dark UI matching the design system.

- Overview: service status counts, per-project health dots, deploy feed
- Services/Projects: status badges, drill-down detail
- Service detail: start/stop/restart/redeploy/sleep/wake, env-doctor
  issues, deployment history + rollback
- Logs: 300-line tail, 5s poll, stderr highlighted
- Databases: status, start/stop/restart, backup-now
- Settings: server info, disconnect

CI: mobile job (tsc + expo lint) gated on a dedicated app/mobile paths
filter so non-mobile PRs skip it entirely.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/mobile/src/session.tsx

@@ -0,0 +1,83 @@
+import React, { createContext, useContext, useEffect, useMemo, useState } from 'react';
+import * as SecureStore from 'expo-secure-store';
+import { Api } from './api';
+
+const KEY_URL = 'containr.server_url';
+const KEY_TOKEN = 'containr.token';
+
+interface Session {
+  ready: boolean;
+  api: Api | null;
+  serverUrl: string | null;
+  signIn: (serverUrl: string, token: string) => Promise<void>;
+  signOut: () => Promise<void>;
+}
+
+const Ctx = createContext<Session>({
+  ready: false,
+  api: null,
+  serverUrl: null,
+  signIn: async () => {},
+  signOut: async () => {},
+});
+
+export function normalizeServerUrl(raw: string): string {
+  let u = raw.trim();
+  if (!/^https?:\/\//i.test(u)) u = `https://${u}`;
+  return u.replace(/\/+$/, '');
+}
+
+export function SessionProvider({ children }: { children: React.ReactNode }) {
+  const [ready, setReady] = useState(false);
+  const [serverUrl, setServerUrl] = useState<string | null>(null);
+  const [token, setToken] = useState<string | null>(null);
+
+  useEffect(() => {
+    (async () => {
+      try {
+        const [u, t] = await Promise.all([
+          SecureStore.getItemAsync(KEY_URL),
+          SecureStore.getItemAsync(KEY_TOKEN),
+        ]);
+        setServerUrl(u);
+        setToken(t);
+      } finally {
+        setReady(true);
+      }
+    })();
+  }, []);
+
+  const value = useMemo<Session>(
+    () => ({
+      ready,
+      serverUrl,
+      api: serverUrl && token ? new Api(serverUrl, token) : null,
+      signIn: async (url, tok) => {
+        const normalized = normalizeServerUrl(url);
+        await SecureStore.setItemAsync(KEY_URL, normalized);
+        await SecureStore.setItemAsync(KEY_TOKEN, tok.trim());
+        setServerUrl(normalized);
+        setToken(tok.trim());
+      },
+      signOut: async () => {
+        await SecureStore.deleteItemAsync(KEY_URL);
+        await SecureStore.deleteItemAsync(KEY_TOKEN);
+        setServerUrl(null);
+        setToken(null);
+      },
+    }),
+    [ready, serverUrl, token],
+  );
+
+  return <Ctx.Provider value={value}>{children}</Ctx.Provider>;
+}
+
+export function useSession() {
+  return useContext(Ctx);
+}
+
+export function useApi(): Api {
+  const { api } = useSession();
+  if (!api) throw new Error('not signed in');
+  return api;
+}