Use @inquirer/prompts for interactive login input

Replaces the hand-rolled readline/raw-mode password prompt with
@inquirer/prompts (input + password). The manual approach broke in
bun-compiled binaries because bun doesn't properly re-open stdin
after closing a readline instance. inquirer handles TTY, raw mode,
and password masking correctly across both node and bun runtimes.

bin/quak.ts

@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 
-import { createInterface } from "node:readline/promises";
-import { stdin, stdout, stderr } from "node:process";
+import { input, password as passwordPrompt } from "@inquirer/prompts";
+import { stdout, stderr } from "node:process";
 import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
 import { join } from "node:path";
 import { Command } from "commander";
@@ -45,46 +45,10 @@ const requireSession = (): Client => {
     return Client.fromJSON(snapshot);
 };
 
-const prompt = async (message: string): Promise<string> => {
-    const rl = createInterface({ input: stdin, output: stderr });
-    const answer = await rl.question(message);
-    rl.close();
-    return answer;
-};
+const prompt = async (message: string): Promise<string> => input({ message });
 
-const promptPassword = async (message: string): Promise<string> => {
-    if (!stdin.isTTY) {
-        return prompt(message);
-    }
-    stderr.write(message);
-    stdin.setRawMode(true);
-    stdin.resume();
-    const chars: string[] = [];
-    return new Promise((resolve) => {
-        const onData = (buf: Buffer) => {
-            for (const byte of buf) {
-                if (byte === 3) {
-                    stdin.setRawMode(false);
-                    process.exit(130);
-                }
-                if (byte === 13 || byte === 10) {
-                    stdin.setRawMode(false);
-                    stdin.removeListener("data", onData);
-                    stdin.pause();
-                    stderr.write("\n");
-                    resolve(chars.join(""));
-                    return;
-                }
-                if (byte === 127 || byte === 8) {
-                    chars.pop();
-                } else {
-                    chars.push(String.fromCharCode(byte));
-                }
-            }
-        };
-        stdin.on("data", onData);
-    });
-};
+const promptSecret = async (message: string): Promise<string> =>
+    passwordPrompt({ message, mask: true });
 
 const program = new Command();
 
@@ -98,18 +62,9 @@ program
     .description("Log in to an Ente account and save the session")
     .action(async () => {
         await init();
-        const email =
-            process.env.QUAK_EMAIL ??
-            (stdin.isTTY ? await prompt("Email: ") : null);
+        const email = process.env.QUAK_EMAIL ?? (await prompt("Email"));
         const password =
-            process.env.QUAK_PASSWORD ??
-            (stdin.isTTY ? await promptPassword("Password: ") : null);
-        if (!email || !password) {
-            stderr.write(
-                "Set QUAK_EMAIL and QUAK_PASSWORD env vars for non-interactive use.\n",
-            );
-            process.exit(1);
-        }
+            process.env.QUAK_PASSWORD ?? (await promptSecret("Password"));
 
         stderr.write("Authenticating...\n");
         try {