Update README: project name, AI note, and current Web UI feature set

- Explain the "nidus" name (Latin for "nest").
- Note that AI coding assistants were used during development and that
  not everything has been fully reviewed yet.
- Bring the Web UI section up to date with the Files, Contacts,
  Calendar, and Account areas that already existed but weren't
  documented.

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

README.md

@@ -2,6 +2,12 @@
 
 A self-hosted **CalDAV**, **CardDAV**, and **WebDAV** server written in Go.
 
+## About the name
+
+The project is called **nidus** — Latin for *"nest"*. Like a nest, it's a
+small, self-hosted, personal home for your own data: calendars, contacts,
+and files, all kept under your own roof instead of a third-party cloud.
+
 ## Features
 
 | Protocol | Use case |
@@ -14,8 +20,9 @@ A self-hosted **CalDAV**, **CardDAV**, and **WebDAV** server written in Go.
 - Per-user isolated collections
 - **Calendar/address book sharing** — grant other users read or write
   access to your calendars/address books
-- **Web UI** — a small dashboard (login, manage shares) at `/web/`, built
-  with templ + Tailwind + htmx
+- **Web UI** — a mobile-friendly app at `/web/` for managing calendars,
+  contacts, files, and account settings (see [Web UI](#web-ui) below),
+  built with templ + Tailwind + htmx
 - Auto-discovery via `/.well-known/caldav` and `/.well-known/carddav`
 - Optional **TLS** (or use a reverse proxy)
 - Structured logging (text or JSON)
@@ -173,17 +180,33 @@ Read-only shares reject any write (PUT/DELETE) with `403 Forbidden`.
 
 ## Web UI
 
-A small server-rendered dashboard is served at `/web/` (separate from the
-DAV endpoints, which stay on HTTP Basic Auth):
+A small server-rendered app is served at `/web/` (separate from the DAV
+endpoints, which stay on HTTP Basic Auth), and works on both desktop and
+mobile browsers:
 
 - **Login** (`/web/login`) — cookie-based session, stored server-side in
   `nidus.db` (`web_sessions` table), independent of DAV Basic Auth. Includes
   a "Show/Hide" password toggle to rule out typos before submitting.
-- **Dashboard** (`/web/`) — lists your own calendars/address books, who
-  they're shared with, and any resources other users have shared with you.
-- **Share management** — add/remove shares directly from the dashboard
-  (same effect as `nidusctl`); updates happen in place via
+- **Dashboard** (`/web/`) — create/delete your own calendars, address
+  books, and ICS/webcal subscriptions; see who your resources are shared
+  with and what others have shared with you; manage sharing grants
+  directly (same effect as `nidusctl`) — updates happen in place via
   [htmx](https://htmx.org/) without a full page reload.
+- **Files** (`/web/files/`) — a browser for the same storage the WebDAV
+  endpoint (`/files/`) serves: navigate folders, create new folders,
+  upload files/folders (including via drag & drop), download, and delete
+  files or folders. Files open **inline** in the browser when the type
+  supports it (video, audio, images, PDF, …) instead of always forcing a
+  download; a separate "Download" action is always available to force a
+  save-as.
+- **Contacts** (`/web/contacts/`) — browse address books, create/edit/
+  delete contacts (name, organization, birthday, phone numbers, emails,
+  addresses, photo), and import/export vCards (`.vcf`).
+- **Calendar** (`/web/calendar`) — month and week views across all your
+  own and shared calendars, create/edit/delete events, per-calendar
+  colors, and import/export `.ics` files.
+- **Account** (`/web/account`) — update your display name/email and
+  change your password.
 - **Logout** (`/web/logout`).
 
 Implementation: [templ](https://templ.guide/) for type-safe Go HTML
@@ -191,8 +214,8 @@ templates, [Tailwind CSS v4](https://tailwindcss.com/) for styling, htmx
 for the sprinkles of dynamic behavior (form submission via POST/DELETE,
 partial page swaps), and TypeScript (compiled to plain JS, `web/ts/`) for
 the few bits of client-side-only logic (e.g. the password-visibility
-toggle) — no separate JS framework needed. The compiled CSS, compiled JS,
-and the htmx bundle are all embedded into the Go binary
+toggle, file drag & drop) — no separate JS framework needed. The compiled
+CSS, compiled JS, and the htmx bundle are all embedded into the Go binary
 (`web/staticassets.go`), so no Node.js is required at runtime, only when
 you change styles, templates, or TypeScript during development:
 
@@ -335,6 +358,16 @@ go test ./... -race
 
 ---
 
+## A note on AI assistance
+
+Large parts of this project's code and documentation were written with
+the help of AI coding assistants (e.g. GitHub Copilot). Changes are
+reviewed and tested where practical, but not every part of the codebase
+has been fully reviewed yet — use accordingly, especially before relying
+on this in security-sensitive environments.
+
+---
+
 ## Dependencies
 
 | Package | Purpose |