refactor: convert to bun-workspaces monorepo (desktop/ + www/)

- Move the Tauri app (React frontend + Rust backend) into desktop/ via
  git mv — configs unchanged (relative paths: tauri.conf.json, vite.config.ts)
- Root package.json becomes a private bun workspace container with
  orchestration scripts; desktop package renamed gridline-desktop
- Scaffold www/ with Astro 7 + Tailwind v4 (hand-wired vite plugin,
  static output, ready for Dokploy)
- Update release.yml for the new layout: projectPath: desktop,
  desktop/src-tauri resource paths, rust-cache workspace path
- Update README + AGENTS.md structure trees and dev commands
- Verified: vitest (1074), cargo test (354), desktop build, tauri dev
  (window launches), tauri build (dmg + app bundles), Astro build

desktop/src/components/connections/PasswordInput.tsx

@@ -0,0 +1,38 @@
+import { useState, forwardRef } from "react";
+import { Eye, EyeOff } from "lucide-react";
+import type { KeyboardEvent } from "react";
+import { INPUT_ROUNDING } from "../../lib/uiConstants";
+
+interface PasswordInputProps {
+  value?: string;
+  placeholder?: string;
+  className?: string;
+  onChange?: (value: string) => void;
+  onKeyDown?: (e: KeyboardEvent<HTMLInputElement>) => void;
+}
+
+export const PasswordInput = forwardRef<HTMLInputElement, PasswordInputProps>(
+  function PasswordInput({ onChange, onKeyDown, className = "", ...rest }, ref) {
+    const [visible, setVisible] = useState(false);
+    return (
+      <div className="relative">
+        <input
+          ref={ref}
+          type={visible ? "text" : "password"}
+          className={`w-full ${INPUT_ROUNDING} bg-surface border border-border px-4 py-2 pr-10 text-sm text-text placeholder-text-muted/60 focus:outline-none focus:border-accent focus:ring-1 focus:ring-accent/50 transition-colors cursor-pointer ${className}`}
+          onChange={(e) => onChange?.(e.target.value)}
+          onKeyDown={(e) => onKeyDown?.(e)}
+          {...rest}
+        />
+        <button
+          type="button"
+          onClick={() => setVisible((v) => !v)}
+          className="absolute right-3 top-1/2 -translate-y-1/2 text-text-muted hover:text-text transition-colors cursor-pointer"
+          aria-label={visible ? "Hide password" : "Show password"}
+        >
+          {visible ? <EyeOff size={16} /> : <Eye size={16} />}
+        </button>
+      </div>
+    );
+  }
+);