Add Cowork UI (phase 2) plan and drop quick-ask window

Defines the shared contract (SSE v2 tool events, artifact kinds and
storage, artifacts API, uploads), five parallel tasks with file
ownership, merge order and verification, and removes the quick-ask
window from the desktop plan.

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

docs/desktop-client.md

@@ -9,7 +9,7 @@ user rather than a chat box in a browser tab. "Cowork-like" means:
 - side panels for artifacts: budget reports, recipes, notes, documents
 - drag files into the agent
 - desktop notifications (scheduled messages, cron jobs, finished runs)
-- a menu-bar icon and a global-hotkey quick-ask window
+- a menu-bar icon and a global hotkey to summon the window
 
 ## Decisions (2026-10-12)
 
@@ -110,13 +110,12 @@ feature detection, so the web app gets them too.**
 ┌──────────────────────── Simba.app (Tauri v2) ─────────────────────────┐
 │ Rust core (small)                                                      │
 │  • tray icon + menu (Ask…, New chat, recent convos, Quit)              │
-│  • global shortcut ⌥Space → quick-ask panel (positioner, always-on-top)│
+│  • global shortcut ⌥Space → show/hide main window                      │
 │  • notifications (plugin-notification)                                 │
 │  • keychain token store, deep-link `simba://`, single-instance         │
 │  • window-state, autostart                                             │
 │                                                                        │
 │  Main window  ──loads──▶  https://<simba-host>/        (full UI)       │
-│  Quick panel  ──loads──▶  https://<simba-host>/quick   (compact route) │
 │  Fallback     ──bundled─▶ offline.html (server unreachable / retry)    │
 └───────────────────────────────┬────────────────────────────────────────┘
                                 │ HTTPS: REST + SSE (same origin, no CORS)
@@ -140,8 +139,8 @@ Why load the remote origin rather than bundle:
   `offline.html` covers "server down / not on VPN".
 
 The frontend detects the shell with `window.__TAURI_INTERNALS__` (or a
-`?shell=desktop` query param) and turns on the native bits: notifications,
-drag-drop paths, and the "open in quick panel" route. Everything else renders
+`?shell=desktop` query param) and turns on the native bits: notifications
+and drag-drop paths. Everything else renders
 the same in a browser.
 
 ### Cowork UI (in raggr-frontend, shared by web and desktop)
@@ -159,8 +158,6 @@ the same in a browser.
   Paperless), `photo` (Immich), `device` (SimbaKit status/weight chart).
 - **Drop zone** over the whole window: images go to the existing vision path;
   PDFs and text go to the new upload endpoint (below).
-- **Quick-ask route** (`/quick`): input + streamed answer only; "Open in Simba"
-  hands the conversation to the main window.
 
 ### Local tool bridge (Simba acts on the Mac)
 
@@ -314,8 +311,8 @@ blue/green stays safe: the old frontend ignores the new fields.
 |---|---|---|---|
 | **0a. Auth fix** (own PR) | access token on every call, single fetch helper, OIDC state in Postgres | auth fix (+ migration if state goes in a table) | Web works through a blue/green flip; the refresh token is only ever sent to `/refresh` |
 | **0b. Spike** (½ day) | `desktop/` Tauri v2 app: one window loading `<simba-host>`, tray icon with Show/Quit, ⌥Space toggles the window, `offline.html` fallback | none | Log in through Authelia inside the webview, stream an answer, survive a `make redeploy` |
-| **1. Native shell** | quick-ask panel (`/quick` route), notifications, window-state, single-instance, autostart, refresh token in the Keychain | none | Hotkey → ask → answer without touching the main window |
-| **2. Cowork UI** | activity timeline, artifact panel + renderers (budget, recipe, note, document first), whole-window drop zone | items 1–3 (`artifacts` table) | Ask "how's the grocery budget" → YNAB artifact opens in the side panel; drop a PDF → summarised |
+| **1. Native shell** | notifications, window-state, autostart, refresh token in the Keychain (no quick-ask window: dropped 2026-10-12) | none | A scheduled-message notification arrives; the login survives an app restart |
+| **2. Cowork UI** ([plan](cowork-ui-plan.md)) | activity timeline, artifact panel + renderers (budget, recipe, note, document first), whole-window drop zone | items 1–3 (`artifacts` table) | Ask "how's the grocery budget" → YNAB artifact opens in the side panel; drop a PDF → summarised |
 | **3. Local tools** | Rust bridge client, filesystem MCP scoped to chosen folders, write-confirm dialog, folder picker | item 7 | "Summarise the PDFs in ~/Downloads/taxes" works; a write prompts first; quitting the app removes the tools |
 | **4. Background agent** | detached runs, notifications feed, desktop channel for scheduled messages, system-browser auth handoff | items 4–6 | Close the window mid-run → notification when done → reopen shows the full timeline |