dvorakmortonxd.dev/agents.md

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. It's not a normal website — it ships a hand-built skeuomorphic console (skeuo, the default) plus a KDE-style desktop simulation that is only offered on phone-width viewports.

• Framework: Next.js 16 (App Router, Turbopack), React 19, TypeScript.
• Styling: plain CSS files — skeuo.css (the console), desktop.css (KDE sim + mobile home), shared.css (components both shells render) and globals.css (base/reset). No CSS-in-JS, no Tailwind utilities in the components (Tailwind is present via PostCSS but the look is hand-written CSS). **Materials are CSS
  • inline-SVG noise only — no texture images.**
• Fonts: Barlow Semi Condensed (metal labels, headings, controls) + Courier Prime (paper, readouts) via next/font/google with explicit fallbacks; Monocraft stays self-hosted in public/ for the desktop's terminal windows.
• Path alias: @/* → src/*.
• Version: 2.1.0 (see package.json).

Scripts

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 shared.css + skeuo.css + desktop.css
  layout.tsx            → html shell, metadata, fonts, ThemeScript
  globals.css           → base/reset styles + Tailwind import
  data.ts               → socials, codingProjects, techProjects, friends, wallpapers
  skeuo.css             → the skeuo console: materials, objects, depth
  desktop.css           → Windows/Plasma desktop + mobile home styles
  shared.css            → styles for components both shells render
  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       → picks which shell to show (the router of the UI)
    SkeuoLayout.tsx     → "skeuo" theme (the console): every section as an object
    WindowsDesktop.tsx  → "desktop" theme, desktop: icons, windows, taskbar
    MobileHome.tsx      → "desktop" theme, phone: app grid + dock
    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 (mobile home screen only)
    useTheme.ts         → theme state via useSyncExternalStore
    ThemeScript.tsx     → inline pre-hydration script: theme + device detection
    ServiceButton.tsx   → service link + live status dot (pings /api/ping)
    ContributionHeatmap.tsx → 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['dmx-theme'], migrating the legacy theme key once (terminal → skeuo, skeuo → desktop), then sets data-theme (skeuo | desktop) and data-device (phone | desktop, from a user-agent sniff) on <html>. Viewports wider than 768 px always get skeuo.
2. useTheme() (in useTheme.ts) reads data-theme via useSyncExternalStore and dispatches a theme-change event on toggle. setTheme("desktop") is refused when the viewport is wider than 768 px, so nothing can leave a desktop visitor stuck in the sim.
3. ThemeRoot always renders SkeuoLayout (kept mounted, just hidden, while the sim is up so its scroll position survives). On phone-width viewports it additionally mounts both WindowsDesktop and MobileHome and lets CSS (html[data-device="phone"]) decide which is visible; they stay mounted while hidden so the Welcome window isn't recreated. The sim is never mounted wider than that.

Themes: skeuo = the site itself (walnut + aluminium console), desktop = the phone-only KDE Plasma / Windows simulation. The physical switch between them sits on the nameplate (.sk-desktop-switch, styled as .sk-switch) and is only visible at ≤ 768 px.

---

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 only by MobileHome for reordering the phone app grid/dock (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), mobile- (phone), app- / kickoff / terminal etc. Grep by prefix to find styles. The skeuo theme's own classes all start with sk- (skeuo.css) and that prefix is reserved for it — desktop.css only ever uses skeuo-* for its two roots.
• The skeuo theme is CSS-only. No texture images, no url() beyond the social SVG masks: wood, aluminium, brass, leather, bakelite, paper, glass and rubber are gradients + color-mix() + an inline-SVG feTurbulence grain (--sk-noise). Build new surfaces from those tokens (--sk-raise-1/2, --sk-sink-1, --sk-alu-*, --sk-brass-*, --sk-wood-*, --sk-paper-*) rather than inventing new colours, and keep the light coming from the top-left. Simplify (drop noise, flatten shadows) at ≤ 768 px.
• shared.css is shared. Both shells render ServiceButton, ContributionHeatmap, JokerLogo, the project cards and the social buttons. Change their base styles only if you check the desktop (.app-surface / .win-body in desktop.css layers its own overrides on top). The skeuo theme restyles them from skeuo.css, scoped to html[data-theme="skeuo"], so the desktop keeps its look. The :root block in shared.css is only the fallback palette those components inherit.
• Motion stays cheap. Transitions are 100–150 ms and only ever animate transform / opacity; pressed states move down and swap their shadow without animating it. Anything animated respects @media (prefers-reduced-motion: reduce).
• The desktop sim is phone-only. .sk-switch is hidden above 768 px and setTheme("desktop") refuses to apply there; ThemeRoot also force-switches back to skeuo when the viewport grows. Don't add another way into the sim without keeping those three guards in place.
• Several places deliberately use imperative DOM work (drag ghost, transform-origin for the mobile launch animation). 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):

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

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