docs: make targets and counts for the guard

desktop-test runs the 39 desktop tests in the backend venv (an absolute
path, so pytest does not warn about sys.prefix); the root README explains
that a '*' in the expansion list means every subdomain, and that the desktop
app answers the zones a hosts file cannot express.

README.md

@@ -58,13 +58,17 @@ Rules live on the server (edit them in the web app or the desktop app); the
 native desktop app enforces them on your machine:
 
 * **Websites** — `/etc/hosts` is rewritten through a tiny privileged helper under
-  polkit. No browser extension, no proxy, works for every app on the machine, and
-  you can audit it with `cat /etc/hosts`.
+  polkit, and the masks a hosts file cannot express are answered by a local DNS
+  stub the helper points `systemd-resolved` at, for the zones it can route. No
+  browser extension, no proxy, works for every app on the machine, and you can
+  audit the hosts region with `cat /etc/hosts`.
 * **Masks** — `youtube.com` blocks the site plus `www.` and `m.`; `*.google.com`
-  blocks every subdomain in your expansion list (a hosts file has no wildcards,
-  so the app expands them for you and tells you when a pattern like `*gram*`
-  cannot be expressed that way). Exceptions take masks too, so `*.google.com`
-  blocked plus `*.docs.google.com` allowed does what you would expect.
+  blocks the bare domain plus every subdomain in your expansion list — add a bare
+  `*` to that list and "every" means every, answered by the DNS stub rather than by
+  guessed hostnames. A hosts file has no wildcards at all, so `*gram*` is reported
+  honestly as unenforceable on the machine rather than silently ignored.
+  Exceptions take masks too, so `*.google.com` blocked plus `*.docs.google.com`
+  allowed does what you would expect.
 * **Applications** — `/proc` is watched and blocked apps are closed (or just
   reported, if you prefer a warning). Entries here are globs as well: `steam*`,
   `*discord*`, matched against the process name and its command line.
@@ -196,14 +200,15 @@ and you can fill everything in from **Settings**.
 ┌──────────────┐        │  • reports + achievements     │        └───────────────┘
 │ Desktop app  │──/api──│  • scheduler (briefing,       │
 │ Qt/QML, D-Bus│        │     report, nudges)           │───────▶  Telegram ⇄ you
-│ hosts + /proc│        └───────────────────────────────┘
+│ hosts+DNS+   │        └───────────────────────────────┘
+│ /proc        │                      │
 └──────────────┘                      │
       enforces                    Postgres
 ```
 
 * `backend/` — FastAPI app. `app/services/` holds the thinking (timer, tasks,
   stats, report, blocker policy, scheduler, bot); `app/sources/` holds one module
-  per integration; `app/api/` is a thin HTTP layer. 63 tests under `backend/tests`.
+  per integration; `app/api/` is a thin HTTP layer. 71 tests under `backend/tests`.
 * `frontend/` — React + TypeScript + MUI, built by Vite into the backend image and
   served from the same origin (so there is no CORS to configure).
 * **The look** — warm paper, ink type, hairline rules instead of boxes and
@@ -214,7 +219,7 @@ and you can fill everything in from **Settings**.
   has to stay readable for colour-blind readers in both themes.
 * `desktop/` — the native app. See [`desktop/README.md`](desktop/README.md).
 * `android/` — the phone client. Everything with interesting behaviour lives in a
-  plain-JVM `:core` module, so 225 tests run on a laptop with nothing but a JDK. See
+  plain-JVM `:core` module, so 234 tests run on a laptop with nothing but a JDK. See
   [`android/README.md`](android/README.md).
 
 ---
@@ -226,6 +231,7 @@ make up               # docker compose up --build
 make dev              # backend with reload + Vite dev server
 make test             # backend test suite
 make desktop          # run the native app from the checkout
+make desktop-test     # desktop app test suite (uses the backend venv)
 make desktop-install  # menu entry + icon
 make helper-install   # the privileged blocking helper
 make report           # build and send today's report right now
@@ -279,11 +285,13 @@ a login screen instead of a header the desktop app fills in for you.
 ## Security notes
 
 * The desktop app never runs as root. The only privileged code is
-  `desktop/helper/kadence-helper` (~200 lines): it validates every hostname,
-  rewrites only the region between its own markers in `/etc/hosts`, writes
-  atomically, keeps a backup, and refuses anything that does not look like a
-  hostname. It is authorised by polkit (`auth_admin_keep` by default — one prompt
-  per session; `install.sh --passwordless` drops that for one user).
+  `desktop/helper/kadence-helper` (~250 lines) and it has exactly two jobs: it
+  validates every hostname, rewrites only the region between its own markers in
+  `/etc/hosts`, writes atomically, keeps a backup, and refuses anything that does
+  not look like a hostname — and it writes one drop-in for `systemd-resolved`
+  pointing the routable zones at the unprivileged DNS stub, which it removes again
+  before the stub stops. It is authorised by polkit (`auth_admin_keep` by default
+  — one prompt per session; `install.sh --passwordless` drops that for one user).
 * Tokens live in the database and in `.env`, are masked in every API response,
   and are never sent to the browser in full. The password is never stored at
   all — only a salted PBKDF2 hash.