# agents.md — cold-boot notes

Quick context so a fresh session (no memory of this project) can be productive in
a minute. Read this first, then skim the files it points at.

---

## Keep README.md AND agents.md in sync — do this on EVERY prompt

**Before you finish any task, update the docs so they still match the code.**
This is a standing requirement, not a one-off, so treat it as part of "done":

**`README.md`** is the user/contributor-facing doc. If a change adds/removes/renames
a feature, script, route, app, theme, file or dependency, reflect it in `README.md`
(Features, Tech Stack, API Routes, Project Structure, Scripts, running/deploying
sections — whichever apply).

**`agents.md`** (this file) is the cold-boot doc for the next session. Update it in
the same task whenever a change touches anything it describes — architecture, the key
files and their invariants, conventions/gotchas, history, or testing notes. A stale
`agents.md` is worse than none: it actively misleads the next session.

For both docs:
- Re-read the doc and the files you touched; fix anything the change made stale.
- Keep the author's voice and existing formatting; don't rewrite the whole thing when
  a small edit will do.
- If a task genuinely changes nothing that either doc describes, it's fine to leave
  that doc untouched — use judgement, don't churn it for nothing.

When in doubt, prefer updating. A stale README **or** agents.md is treated as a bug.

---

## What this project is

Personal portfolio site for **dvorakmortonxd.dev**. The default view is a
**gruvbox editorial page** (a technical-print layout, no images); a "Desktop mode"
button swaps to a **KDE Plasma desktop simulation**. Phones only ever get the
editorial page.

- Framework: **Next.js 16** (App Router, Turbopack), **React 19**, TypeScript.
- Styling: **Tailwind v4** for the editorial page — `globals.css` is the design
  system (CSS custom properties, `@theme` tokens, `@utility` classes) — plus plain
  CSS for the desktop (`skeuo.css`) and the shared component styles the desktop
  apps still use (`page.css`).
- Path alias: `@/*` → `src/*`.
- Version: `3.0.0` (see `package.json`).

### Scripts
```bash
npm run dev      # node scripts/dev-server.mjs (dev + HMR; strips dev-only debug for non-local access)
npm run dev:next # next dev --turbopack (raw, UNPROTECTED escape hatch — don't use behind the tunnel)
npm run build    # next build --turbopack
npm run start    # next start
npm run lint     # eslint
```
Useful checks before handing work back: `npx tsc --noEmit`, `npx eslint <files>`,
`npm run build`.

### Git
Branch is **main**. Remote is a self-hosted **Forgejo** instance (the "GitDXD"
app) at `git.dvorakmortonxd.dev`. **The remote URL contains a plaintext access
token.** Do not print it, copy it into new files, or push it anywhere else.

---

## Network resources

- **SearXNG** is running on the LAN at `http://192.168.0.7:8888`. Feel free to use
  it for web searches whenever you need current information.

---

## Architecture

```
src/app/
  page.tsx              → renders <ThemeRoot/>, imports the theme stylesheets
  layout.tsx            → html shell, metadata, next/font, ThemeScript
  globals.css           → gruvbox editorial design system (tokens, @utility, base, reveals)
  editorial.css         → editorial page helpers (social masks, heatmap)
  page.css              → shared component styles used by the desktop apps
  skeuo.css             → KDE Plasma desktop styles
  data.ts               → socials, codingProjects, techProjects, friends, wallpapers
  revival-inc/page.tsx  → fullscreen iframe embedding /public/revival-inc/index.html
  api/
    heatmap/route.ts    → proxy for git.dvorakmortonxd.dev contribution heatmap
    activities/route.ts → proxy for the user's GitDXD activity feed
    ping/route.ts       → service health check (HTTP + minecraft:// via mcstatus.io); host allowlist
    frame/route.ts      → header-stripping proxy so an unframeable friend site loads in a window; host allowlist
  components/
    ThemeRoot.tsx       → editorial page by default, desktop when theme === "skeuo"
    EditorialSite.tsx   → the gruvbox editorial page (nav, hero, sections)
    editorial-ui.tsx    → editorial primitives: Reveal, Section, ServiceRow, Contributions, …
    WindowsDesktop.tsx  → "skeuo" theme, desktop: icons, windows, taskbar
    WinWindow.tsx       → a single draggable/resizable window
    apps.tsx            → APPS registry + the content of each app + in-app terminal
                          + embedded-site windows + the Minecraft-style SMP menu
    useDesktopIcons.ts  → desktop icon grid + drag/drop  (THE KEY FILE, see below)
    useDragOrder.ts     → simple list reordering (used inside desktop apps)
    useTheme.ts         → theme state via useSyncExternalStore
    ThemeScript.tsx     → inline pre-hydration script: theme + device detection
    ServiceButton.tsx   → desktop service link + live status dot (pings /api/ping)
    ContributionHeatmap.tsx → desktop heatmap + recent-commit widget (uses the two proxies)
    Clock.tsx           → live clock (useSyncExternalStore + interval)
    JokerLogo.tsx       → site logo with a click easter egg
scripts/
  dev-server.mjs      → custom dev server: live updates minus the dev-only debug surface
```

### How UI selection works
1. `ThemeScript` runs before paint. It reads `localStorage.theme` and sets
   `data-theme` (`gruvbox` | `skeuo`) and `data-device` (`phone` | `desktop`) on
   `<html>` from a user-agent sniff. On a phone it forces `gruvbox` and CSS hides
   every `.desktop-toggle`, so the desktop is unreachable there.
2. `useTheme()` (in `useTheme.ts`) reads `data-theme` via `useSyncExternalStore`;
   `setTheme` writes the attribute, persists to `localStorage`, and dispatches
   `theme-change`.
3. `ThemeRoot` renders `EditorialSite` unless `theme === "skeuo"`, in which case it
   mounts `WindowsDesktop` instead. The editorial page stays mounted (hidden) while
   the desktop is up so its scroll position survives; the desktop mounts on demand
   (phones can never reach `skeuo`).

Modes: `gruvbox` = the default editorial site, `skeuo` = KDE Plasma desktop.

The editorial page is **asset-free** apart from the social SVGs, which are used as
monochrome CSS masks (`.social-mask` in `editorial.css`). `linkedin.svg` is a filled
badge that masks to a plain square, so `editorial-ui.tsx` renders an inline mark for
it instead. The desktop still uses the image assets.

---

## `useDesktopIcons.ts` — the desktop icon grid (read this carefully)

This is the most edited and most subtle file in the repo. It owns desktop icon
placement: both the default layout and drag-and-drop. If something is wrong
with icons, it's almost certainly here.

### Design
- The three icon groups (apps on the left, services top-right, friends
  bottom-right) are **real flex stacks** in the DOM at `.win-icons` (plus
  `.win-icons-tr` / `.win-icons-br`). They are rendered **hidden** with class
  `win-measure` purely so the grid can be measured from them.
- On mount (a `useLayoutEffect`), `measure()` reads the real rendered boxes of
  those stacks: cell size = icon width/height, and origin = the left stack's
  offset. The row pitch is cell height **+ the CSS flex gap** (`GRID_GAP`,
  currently 4px). The column pitch starts at cell width + gap but is **stretched
  a hair** so the grid spans from the left margin to the right margin — a fixed
  pitch left up to a full cell of slack on the right, which pulled the
  right-anchored services/friends stacks away from the border. From that it
  computes `cols` / `rows` for the whole desktop.
- `defaultCells()` assigns each icon the cell its stack already occupies. So
  **the grid you see on load is the grid dragging uses** — no re-layout jump.
- On cramped viewports, CSS media queries shrink `.win-icon` (glyph, label and
  all). Because the grid is measured from the rendered icons, it adapts
  automatically and there is always a cell per icon — that is what keeps icons
  from colliding on small/narrow screens. Don't hardcode icon sizes in the grid
  maths; shrink them in CSS instead.
- Icons are then rendered absolutely positioned in `.win-icon-layer`, driven by
  the `positions` map (`{ [iconId]: {x, y} }`).
- Dragging: `onPointerDown` builds a **ghost** (a clone of the button appended
  to `document.body`, moved with `translate()` under a `grabbing` cursor). The
  ghost is built imperatively on purpose — moving it must not re-render React.
- Drops snap to a cell. `normalize()` is the single guard that enforces
  **one icon per cell**: it assigns icons in a stable order and bumps any
  collision to the nearest free cell. Every mutation path (initial layout,
  drop, window resize) goes through it.

### Invariants — do not break these
1. **One icon per cell.** All position mutations must run through `normalize()`.
2. **The grid must not change shape on first drag.** Default cells come from
   measuring the real layout; don't hardcode cell sizes.
3. **The init effect must run exactly once.** It depends only on `iconKeys`,
   which is the module-level constant `ICON_KEYS` in `WindowsDesktop.tsx`. If
   you pass a fresh array literal here you WILL get "Maximum update depth
   exceeded" (this bug has already happened once — see history below).

### Gotcha: native drag hijacks the pointer gesture
Icons whose glyph is an `<img>` (the friend shortcuts, which use `next/image`
with `/skopec.svg`, `/bukovina.svg`, `/vlcak.svg`) can start the browser's
**native image drag**, which fires `pointercancel` and kills the custom drag.
Emoji-based icons are unaffected, which makes this look like "only some icons
don't drag".

Guard (already in place, keep it that way):
- `draggable={false}` on the `<Image>` in `renderIcon`.
- CSS `-webkit-user-drag: none` on `.win-icon` and its children.
- CSS `pointer-events: none` on `.win-icon-glyph img` / `.win-icon-label` so
  `e.target` is always the button.

### Related
`useDragOrder.ts` is a **different, simpler** hook used inside the desktop apps
for reordering lists (drag one item over another to swap). It is list reordering,
not free placement. Don't confuse the two.

---

## History of the desktop-icon work (why the code looks like this)

1. **Free placement.** First version let icons go anywhere. Worked, but icons
   could overlap and the layout jumped into a grid on first drag.
2. **Grid snapping.** Dropped icons snap to a grid cell; dropping onto an
   occupied cell bumps the occupant.
3. **Grid bug fixes.** The cell pitch originally omitted the 4px flex gap, and
   the drop calculation rounded differently from the occupancy check, so two
   icons could land in the same cell. Fixed by deriving pitch from measured
   boxes **plus gap**, and by routing everything through `normalize()`.
4. **Layout no longer jumps.** Grid measured from the real stacks and applied
   before paint, so load layout == drag layout.
5. **Infinite loop fix.** `iconKeys` was an inline array literal in the effect
   deps → the effect re-ran every render → `setState` → loop. Hoisted to the
   module constant `ICON_KEYS` and dropped the unstable callbacks from deps.
6. **Friend icons couldn't be dragged.** Native image drag on the
   `next/image` glyph fired `pointercancel`. Fixed with `draggable={false}` +
   `-webkit-user-drag: none`.
7. **Right-edge gap.** Columns tiled from the left with a fixed pitch, so the
   right-anchored stacks (services/friends) stopped up to a full cell short of
   the right border (e.g. ~90px on a 1920px screen), and any remount/resize
   re-snapped them. Fixed by stretching the column pitch so the grid spans both
   margins; the row pitch is unchanged.

---

## Conventions & things that will bite you

- Components are client components (`"use client"` at the top) — they use
  pointer events and window APIs freely.
- CSS classes are prefixed by area: `win-` (desktop), `app-` / `kickoff` etc.
  (desktop windows), plus the editorial design-system classes (`shell`, `display`,
  `label`, `rule*`, `glass*`). Grep by prefix to find styles.
- The editorial page reveals blocks with `.reveal` (see `Reveal` in
  `editorial-ui.tsx`): hidden by default, `.is-in` shows. On load the first
  screenful cascades top-to-bottom (90ms per block, in DOM order); the rest
  reveal when they scroll in. **Wrap every content block** — anything left
  unwrapped paints before the top and breaks the top-to-bottom order. The
  `<noscript>` rule in `layout.tsx` keeps everything visible without JS.
- Several places deliberately use **imperative DOM work** (e.g. the drag ghost).
  This is intentional for performance; prefer matching the existing pattern over
  "Reactifying" it.
- `setState` inside an effect is blocked by the ESLint config
  (`react-hooks/set-state-in-effect`). The one intentional exception is the
  grid init in `useDesktopIcons.ts`, which carries a scoped
  `eslint-disable-next-line` with a comment. Don't add more without a reason.
- Watch for `pointercancel`: any custom pointer gesture over an `<img>`, link,
  or text selection needs `draggable=false` / `user-select: none`.
- Windows must stay on-screen: `openAppDef` / `resizeWin` clamp `w`/`h`,
  `moveWin` clamps `x`/`y` (dragging can't push a window off any edge or under
  the panel), a `resize` effect re-clamps on browser resize, and
  `.win-window.centered` carries `max-width`/`max-height`. Keep these in sync if
  you add a new window path, or windows will escape the viewport. The bottom
  limit is `TASKBAR_HEIGHT = 59` in `WindowsDesktop.tsx` (panel top at 54px + a
  5px gap), so dragged and maximized windows stop 5px above the taskbar. That
  `59` is duplicated in `skeuo.css` (`.win-window.maximized` height,
  `.win-window.centered` bottom / max-height) — keep them in sync. Note
  `useDesktopIcons.ts` has its **own** `TASKBAR_HEIGHT = 48` for the icon grid.
- **Serving the dev server through the tunnel: read this.** `npm run dev` does
  **not** run `next dev` directly — it runs `node scripts/dev-server.mjs`, a
  custom server that wraps Next's request handler. It keeps the live-update
  path (`/_next/hmr`, Fast Refresh) but returns `404` for Next's dev-only debug
  endpoints (`/__nextjs*`: launch-editor, original stack frames, source maps,
  node-inspector attach, server restart, …) and for `*.map` whenever the
  request did **not** arrive over loopback without proxy headers. Those
  endpoints are unauthenticated, and Next wires them in unconditionally, so
  `next.config.ts` cannot disable them — that is what makes a publicly
  tunnelled dev server unsafe. Net effect:
  `localhost:3000` keeps the full dev experience; the LAN/tunnel get a plain,
  live-reloading site. Use `npm run dev:next` only if you explicitly want the
  raw, unprotected server (never point the tunnel at it).
- The dev server runs on this host as a **system** systemd unit
  (`/etc/systemd/system/dvorakmortonxd-dev.service`, kept in-repo at
  `deploy/dvorakmortonxd-dev.system.service`, installed by
  `deploy/install-system-service.sh`). It is enabled at `multi-user.target`, so
  it starts at boot with no login/linger. `systemctl restart dvorakmortonxd-dev`
  reloads it; logs with `journalctl -u dvorakmortonxd-dev -f`. The unit pins
  `HOSTNAME=0.0.0.0` (the script reads that env var) so the tunnel can reach
  :3000, clears a stale `.next/dev/lock` on start, and sets `HOME` because system
  units don't inherit a login environment. A per-user twin
  (`deploy/dvorakmortonxd-dev.service`) exists for rootless installs; it needs
  `loginctl enable-linger` and is driven via `systemctl --user`. Only one of the
  two may run at a time — they contend for :3000 and `.next/dev/lock`.
- `allowedDevOrigins` (`next.config.ts`) still matters: the tunnel host and any
  LAN origin must be listed or Next rejects the HMR WebSocket with a 403 (the
  client then never hydrates — SSR only, icons stacked at `(0,0)`, dead
  buttons). Keep it tight (private ranges + the one exact tunnel host); a
  `**.dvorakmortonxd.dev` wildcard would let any subdomain drive the dev
  server. Changing `next.config.ts` needs a dev-server restart.
- `devIndicators: false` in `next.config.ts` hides Next's on-screen dev badge.
- For a fully public URL a production build (`npm run build && npm run start`)
  is still the gold standard: no dev server, no debug endpoints, no HMR socket.
- The SMP service shortcut opens `SMP_APP` (in `apps.tsx`, registered in
  `APP_BY_ID` only, like `ALACRITTY_APP`) — a Minecraft-style join menu that
  reads live data from `/api/ping?url=minecraft://…`.
- `/api/ping` is a **host-allowlisted** SSRF guard (public + unauthenticated):
  it only contacts `*.dvorakmortonxd.dev` plus the friends' domains, rejects
  other hosts/schemes, validates the `minecraft://` address, and never follows
  redirects. **Adding a service or friend host means adding it to
  `ALLOWED_HOSTS` in `api/ping/route.ts`**, otherwise its status dot reads
  "Dead". Do not turn this route back into an open fetch proxy.
- Service shortcuts can show the real site in an iframe via
  `createWebsiteApp({ embed: true })` (the shortcut's `embed` flag), but the
  browser refuses to frame a site that sends `X-Frame-Options` /
  `frame-ancestors`, leaving a blank window. `embed` is set on Llama.cpp (Open
  WebUI), Jellyfin, Navidrome and GitDXD. Llama.cpp/Jellyfin allow framing out
  of the box; the other two need their host configured so the header is an
  unrecognised value (browsers ignore unknown X-Frame-Options values):
  Navidrome via `ND_HTTPHEADERS_FRAMEOPTIONS=ALLOWALL` (it maps
  `HTTPHeaders.FrameOptions` to that env var and it overrides the built-in
  `FrameDeny`), and Forgejo via `[cors] X_FRAME_OPTIONS = unset` (Forgejo reads
  this from the `[cors]` section, **not** `[security]`) followed by a Forgejo
  restart. For a scoped, clickjacking-safe alternative, remove the header at the
  edge (Cloudflare "Modify Response Header" / nginx) and add
  `Content-Security-Policy: frame-ancestors`. Discord keeps a link card because
  it sends `DENY` and can't be configured. Always verify headers before enabling
  `embed` on a new service.
- Friend shortcuts reuse the same embed path, driven by `data.ts`. `friend.iframe`
  is the `embed` flag; `friend.url` is what the frame loads and `friend.realUrl`
  is what the www button opens — `createWebsiteApp`'s `embedUrl` option lets the
  two differ. `bukovinafilip.com` and `vlcak.me` send no framing headers, so they
  frame the live site. `skopec.dev` sends `X-Frame-Options: SAMEORIGIN` on every
  path, so `friend.proxy` routes it through `/api/frame`.
- `/api/frame` is a **host-allowlisted** header-stripping proxy for sites that
  refuse framing. It fetches the HTML server-side (so the upstream
  `X-Frame-Options` never reaches the browser), injects `<base href="origin/">`
  so relative assets still resolve to the real site, and injects a click shim so
  same-host navigation is proxied too. It only proxies `ALLOWED_HOSTS`
  (`skopec.dev`), never follows redirects, rejects credentials and non-http(s),
  and returns HTML only — it is public, so keep it that narrow. The framed page
  executes under our origin, so only allow-list hosts you trust.
- **Embedded iframes swallow the pointer.** While dragging/resizing a window,
  the moment the cursor passes over a service `<iframe>` the site's own document
  receives the `pointermove`/`pointerup`, so a gesture that listens on `window`
  (see `WinWindow.tsx`) freezes mid-drag. `WinWindow` therefore flags the window
  `interacting` for the duration of the gesture and CSS sets
  `pointer-events: none` on `.website-embed-frame` until it ends. Keep that rule
  if you add another gestural interaction that can pass over an embed.
- `EmbeddedSite` (in `apps.tsx`) shows a spinner until the iframe fires `load`,
  because Navidrome/Forgejo are SPAs that render blank for a moment while they
  boot.
- Reduced motion is handled with a near-zero `animation-duration` (not
  `animation: none`) so `animationend` still fires and windows unmount.

## Testing notes
- There is **no test suite**. Verification is `tsc --noEmit`, `eslint`, and
  `next build`.
- A dev server may already be running on port 3000 — on this host it is normally
  the **system** `dvorakmortonxd-dev` service, so check
  `systemctl status dvorakmortonxd-dev` first. Two dev servers on this repo
  collide on `.next/dev/lock`; stop the service (or the old process) before
  starting the custom server by hand.
- Dev-server guard check: `curl -s -o /dev/null -w '%{http_code}' \
  http://localhost:3000/__nextjs_server_status` must be `200` (localhost keeps
  debug), while the same path through the LAN IP or `beta.dvorakmortonxd.dev`
  must be `404`. Note a request from this host to its **own** LAN IP is routed
  over loopback, so `localAddress` reads `127.0.0.1` — a same-host curl to the
  LAN IP does NOT exercise the non-loopback branch. Test that branch through
  the tunnel or from another machine. HMR is fine as long as a real
  `/_next/hmr` WebSocket upgrade returns `101` and then sends a frame (the HMR
  client appends `?id=self.__next_r` from the served HTML).
- The desktop layout is geometry-heavy. When changing grid maths, a small
  standalone script mirroring `normalize()` / `posToCell()` is a fast way to
  prove one-icon-per-cell holds for edge cases (offscreen drops, tiny
  viewports, repeated drops on one cell).
- To verify a service iframe embed without a GUI browser: check the header with
  `curl -sI <service>` (you want no `X-Frame-Options`, or a value a browser
  doesn't recognise), then drive Playwright's cached Chromium
  (`~/.cache/ms-playwright/chromium-*/chrome-linux64/chrome`) headlessly at a
  small HTML page that iframes the service and `--screenshot` it. Its system
  libs can be fetched without root via `apt-get download` + `dpkg-deb -x` into a
  local dir and `LD_LIBRARY_PATH`. Frame the test from an `http(s)` origin (e.g.
  a file dropped in `public/` served at `localhost:3000`); a `file://`
  top-level blocks the iframe's storage and makes working sites look blank.
  For a site that refuses framing, `/api/frame?url=<site>` should return `200`
  with no `X-Frame-Options` and `frame-ancestors 'self'`, while `?url=` for any
  other host returns `403`.

---

## After finishing — push to git

First make sure `README.md` **and** `agents.md` are up to date (see "Keep
README.md AND agents.md in sync" at the top), then run **only** these three
commands (no extra flags, no rebasing, no force-push):

```bash
git add .
git commit -m "<WHAT CHANGED>"
git push origin main
```

Replace `<WHAT CHANGED>` with a short, specific summary of the change.