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>

Makefile

@@ -1,4 +1,4 @@
-.PHONY: build run test tidy lint docker hash-password nidusctl web-deps web-css templ-generate
+.PHONY: build run test tidy lint docker hash-password nidusctl web-deps web-css web-ts web-assets templ-generate
 
 ## build: compile the binary
 build:
@@ -43,7 +43,7 @@ nidusctl: build
 templ-generate:
 	templ generate
 
-## web-deps: install the Tailwind CLI (needed once, or after web/package.json changes)
+## web-deps: install the Tailwind CLI + TypeScript compiler (needed once, or after web/package.json changes)
 web-deps:
 	cd web && npm install
 
@@ -51,3 +51,11 @@ web-deps:
 ## Run this after editing any .templ file or web/input.css.
 web-css: templ-generate
 	cd web && npx @tailwindcss/cli -i ./input.css -o ./static/app.css --minify
+
+## web-ts: compile web/ts/*.ts to web/static/*.js
+## Run this after editing any .ts file.
+web-ts:
+	cd web && npx tsc -p tsconfig.json
+
+## web-assets: rebuild everything under web/static/ (CSS + JS)
+web-assets: web-css web-ts