Add password-visibility toggle to login page (TypeScript)

- web/ts/login.ts: small vanilla TS module toggling the password input's
  type between 'password'/'text' via a 'Show/Hide' button, so users can
  rule out typos before submitting. Compiled to web/static/login.js
  (ES module) via tsc (web/tsconfig.json, new 'make web-ts'/'web-assets'
  Makefile targets) and loaded via <script type="module">. Compiled JS
  is committed/embedded the same way as the compiled CSS — no Node.js
  needed at runtime.
- Verified end-to-end against the live proxied server
  (https://local.unqr.dev/web/login): POST /web/login correctly returns
  303 + Set-Cookie, and the session then authorizes GET /web/ — the
  server-side login flow is confirmed working correctly.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

internal/web/templates/login.templ

@@ -23,8 +23,14 @@ templ Login(errorMsg string) {
 					</div>
 					<div>
 						<label for="password" class="block text-sm font-medium text-gray-700">Password</label>
-						<input id="password" name="password" type="password" required
-							class="mt-1 block w-full rounded-md border-gray-300 border px-3 py-2 shadow-sm focus:border-indigo-500 focus:ring-indigo-500"/>
+						<div class="mt-1 flex gap-2">
+							<input id="password" name="password" type="password" required
+								class="block w-full rounded-md border-gray-300 border px-3 py-2 shadow-sm focus:border-indigo-500 focus:ring-indigo-500"/>
+							<button type="button" id="toggle-password" aria-pressed="false"
+								class="shrink-0 rounded-md border border-gray-300 px-3 py-2 text-sm text-gray-600 hover:bg-gray-50">
+								Show
+							</button>
+						</div>
 					</div>
 					<button type="submit"
 						class="w-full bg-indigo-600 text-white rounded-md py-2 font-medium hover:bg-indigo-700">
@@ -32,6 +38,7 @@ templ Login(errorMsg string) {
 					</button>
 				</form>
 			</div>
+			<script type="module" src="/web/static/login.js"></script>
 		</body>
 	</html>
 }