feat: v0.5.0 header, switcher, phone key bar, shared polling, Matrix "needs you"

- Header: no SSO chip ("Sign in again" only on expiry), state dot on the
  session chip, LIVE as a dot, ⋯ menu for text size/notifications/fullscreen,
  Panels badge for waiting sessions and alerts.
- Session switcher on the chip; bare URL reattaches the last session; + New
  opens the panel form with project folders.
- Notifications when other sessions start waiting; alerts polled with the
  panels closed; one tab polls for all tabs over BroadcastChannel.
- Sidebar: context bar per session instead of the Context panel; compact
  Repo/CI with "Ask Claude to fix CI"; legible labels.
- Phone: key bar, drawer with backdrop, visualViewport-aware layout, DOM
  renderer on touch, compact connection dot.
- devdesk-notify-matrix: one Matrix message per wait that lasts
  DEVDESK_MATRIX_DELAY seconds with nobody attached.

Closes #8
Closes #13
Closes #14
Closes #15
Closes #16
Closes #17
Closes #28

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -28,22 +28,25 @@ The tmux server runs in its own unit, so every Claude process lives in **that**
   - `main` is the projects root.
 - **Opening one:**
   - `https://dev.lotusguild.org/?arg=<name>` opens or creates that session.
-  - With no `?arg=`, an fzf picker opens, listing running (●), dormant (○) and new (+) sessions.
-  - The **Sessions** panel's form takes any name plus an optional project folder.
+  - With no `?arg=`, DevDesk reattaches the session you used last in this browser (or the most recently active one). The fzf picker, listing running (●), dormant (○) and new (+) sessions, is under the session chip's menu.
+  - **Session chip** (header): click to switch sessions; its dot shows Claude's state.
+  - **+ New** in the Sessions panel takes any name plus an optional project folder.
 - **Rename / end:** the ✎ and × buttons on each session in the panel. Renaming keeps the session, its running Claude and its recorded conversation. Ending stops Claude; the conversation stays in Claude's history.
 - **Windows:** each session has a `claude` window (0) and a `shell` window (1).
 - **Conversation tracking:** a Claude `SessionStart` hook records each session's conversation ID in `/var/lib/devdesk/registry.json`. After a reboot the session resumes *that* conversation, even when other Claude instances, such as code-server, use the same directory.
 - **Session status:** Claude hooks (`devdesk-state-hook`) mark each session **working**, **waiting on you** (with Claude's message) or **idle**.
-  - The sidebar shows it with context %, and the header shows the current session's state.
-  - A pulsing "… needs you" chip jumps to other sessions that are waiting.
+  - The sidebar shows it with context % and a context bar; the session chip's dot shows the current session's state.
+  - A "… needs you" chip jumps to other sessions that are waiting, and a desktop notification fires when one starts waiting. With the panels closed, the **Panels** button shows a count of waiting sessions and Grafana alerts.
+- **Matrix "Claude needs you":** when a session has waited for `DEVDESK_MATRIX_DELAY` seconds (30) and no browser tab or SSH client is attached to it, `devdesk-notify-matrix` posts one message per wait, with a link, to the hookshot webhook URL in `/etc/devdesk/matrix-webhook` (mode 600; no file = off).
 - **File & image drop:** drag files onto the terminal or paste a screenshot.
   - They're uploaded through ttyd to `/var/lib/devdesk/uploads/<session>/` (25 MB max, pruned after 7 days), and the path is pasted into Claude.
   - For images, Claude attaches them itself.
 - **Ops Alerts panel:** firing and pending Grafana alert rules, each with a link to the rule.
   - **Ask Claude** types an investigation prompt into the current session without sending it.
   - Configure `DEVDESK_GRAFANA_URL`, plus a Viewer token in `DEVDESK_GRAFANA_TOKEN_FILE`.
-- **Repo / CI panel:** branch, ahead/behind, uncommitted changes, HEAD's Gitea CI status and open PRs for the session's folder.
-- **Claude Context panel:** a Claude `statusLine` command (`devdesk-statusline`) snapshots each session's model, context-window use, cost and edits to `/var/lib/devdesk/context/<session>.json`. The panel shows the current session's numbers, and Claude's own footer shows a one-line summary. Sessions started before 0.2.0 need Claude restarted (`/exit`, then ⏎ in the menu) before they report.
+- **Repo / CI panel:** branch, ahead/behind, uncommitted changes, HEAD's Gitea CI status and open PRs for the session's folder. When CI fails, **Ask Claude to fix CI** types a prompt to read the failed job's log.
+- **Context:** a Claude `statusLine` command (`devdesk-statusline`) snapshots each session's model, context-window use and cost to `/var/lib/devdesk/context/<session>.json`. The Sessions panel shows it as a bar (cost in the tooltip), and Claude's own footer shows a one-line summary.
+- **Phone:** a key bar replaces the shortcut hints (Esc, Tab, ⇧Tab, ^C, ↑, ↓, ⏎, Claude/Shell window), and the panels open as a drawer.
 - **SSH:** `devdesk attach <name>`, `devdesk new <name> [project]`, `devdesk rename <old> <new>`, `devdesk end <name>`, `devdesk ls`, `devdesk pick`, `devdesk repo <name>`, `devdesk alerts`.
 
 ## Keys
@@ -57,7 +60,7 @@ The tmux server runs in its own unit, so every Claude process lives in **that**
 | Shift+drag | Native browser selection (plain drag goes to tmux copy-mode, which copies via OSC 52) |
 | Ctrl+Shift+C / V | Copy selection / paste |
 
-Use the **Full** button for fullscreen. In Chromium it also captures Ctrl+W/Ctrl+T, which browsers otherwise keep for themselves.
+Text size, desktop notifications (with a mute) and fullscreen are in the **⋯** menu. In Chromium, fullscreen also captures Ctrl+W/Ctrl+T, which browsers otherwise keep for themselves.
 
 ## Configuration
 - **Put your changes in `/etc/devdesk/env.local`.** It's read after the packaged `env` and never shipped, so `apt upgrade` never asks about it. Example: `DEVDESK_REMOTE_CONTROL=1`.
@@ -66,6 +69,7 @@ Use the **Full** button for fullscreen. In Chromium it also captures Ctrl+W/Ctrl
   - `DEVDESK_GITEA_URL` / `DEVDESK_GITEA_ALIASES` for the Repo/CI panel. Public repos need no token; for private ones put a `read:repository` token in `/etc/devdesk/gitea-token`
   - `CLAUDE_BIN` and `CLAUDE_ARGS`
   - `DEVDESK_REMOTE_CONTROL=1`, which also starts each session with Claude Remote Control so it can be continued from the Claude app
+  - `DEVDESK_PUBLIC_URL`, `DEVDESK_MATRIX_WEBHOOK_FILE` and `DEVDESK_MATRIX_DELAY` for the Matrix notifications
 - `/etc/devdesk/secret.env` is generated on install. It holds the ttyd credential that NPM must inject; see [docs/DEPLOY.md](docs/DEPLOY.md).
 - `/etc/devdesk/tmux.local.conf` is optional and is sourced after the packaged `tmux.conf`.
 
@@ -84,4 +88,4 @@ CI (`.gitea/workflows/build-deb.yml`):
 - A `v*` tag also publishes to `https://code.lotusguild.org/api/packages/LotusGuild/debian`, creates a release, and auto-deploys to CT 126. A signed webhook runs `devdesk-deploy`, which upgrades the package; see [docs/DEPLOY.md](docs/DEPLOY.md).
 
 ## Roadmap
-- Matrix "Claude needs you" notifications when no tab is open.
+Tracked in [Gitea issues](https://code.lotusguild.org/LotusGuild/devdesk/issues) by milestone: v0.6.0 file viewer, v0.7.0 editor + inbox, backlog.