feat(run,ui): make the lane console usable — terminal focus, live-exit recovery, auto permission mode, model aliases

Terminal (issue #33):
- `convertEol` is gone from xterm. It rewrote every bare LF as CR+LF, so a
  tmux pane that scrolled (tmux emits a bare LF and keeps drawing at the
  column it was on) had the rest of that draw land at column 0, stamping a
  line's first characters into the left margin of the rows below — the torn
  left edge that only showed up once content scrolled.
- The attach carries the client's real size (`?cols=&rows=`, `sizeFromQuery`
  in `server/websocket.js`, bounded because it reaches a TIOCSWINSZ ioctl).
  `attach()` spawned `tmux attach-session` at a hardcoded 80x24 on every
  attach, and tmux sizes the window to the newest client, so `claude` redrew
  its whole UI at 80 columns until the first `resize` message landed.
- The terminal takes the keyboard on mount, so typing reaches tmux without
  clicking the pane first.
- A pane that ends (double Ctrl+C, `exit`, a crash) reports itself through a
  new `onExit` prop and `LaneConsolePane` runs `newRun()`, so the console
  returns to the setup form instead of leaving a dead pane behind a
  "New run" button.

Pane environment:
- `server/lib/desktop-env.js` forwards the graphical session's DISPLAY /
  WAYLAND_DISPLAY / XAUTHORITY / XDG_RUNTIME_DIR (from
  `systemctl --user show-environment`, this process's own values winning)
  into the pane. The server normally runs as a systemd user service with none
  of them, so `claude` there could not read the clipboard and answered "no
  image found in clipboard" on every image paste.

Run setup:
- `auto` is a permission mode and is now the default everywhere — allowlists,
  the `--permission-mode` fallback, the select, and the pane's initial state.
- The model picker sends the CLI's aliases (`fable`/`opus`/`sonnet`/`haiku`)
  instead of pinned ids. `claude --model` resolves an alias to the latest
  model itself, so a release like Fable 5.1 needs no edit here; pricing is
  unaffected because it keys off the resolved id the transcript reports.
- **Create/update readme file** moved from the Add-lane modal into the lane's
  Tools menu: creating a lane and writing its docs are separate decisions,
  and the second is worth re-running long after the first.
- The Workspace's no-lane state is a real banner; the lane strip (add tile
  included) renders only once a lane exists.

Refs #32, #33.

Tests: npm run test:server (1828 pass), client vitest (558 pass).

server/openapi-extra/run.js

@@ -102,10 +102,10 @@ const schemas = {
       },
       permissionMode: {
         type: "string",
-        enum: ["acceptEdits", "default", "plan", "bypassPermissions"],
+        enum: ["auto", "acceptEdits", "default", "plan", "bypassPermissions"],
         description:
-          "Permission mode passed via `--permission-mode`. Defaults to `acceptEdits` when omitted or invalid.",
-        example: "acceptEdits",
+          "Permission mode passed via `--permission-mode`. Defaults to `auto` when omitted or invalid.",
+        example: "auto",
       },
       effort: {
         type: "string",
@@ -316,9 +316,9 @@ const schemas = {
       permission_mode: {
         type: "string",
         nullable: true,
-        enum: ["acceptEdits", "default", "plan", "bypassPermissions"],
+        enum: ["auto", "acceptEdits", "default", "plan", "bypassPermissions"],
         description: "Permission mode recorded at spawn time.",
-        example: "acceptEdits",
+        example: "auto",
       },
       effort: {
         type: "string",
@@ -516,11 +516,11 @@ const schemas = {
       },
       permissionMode: {
         type: "string",
-        enum: ["acceptEdits", "default", "plan", "bypassPermissions"],
-        default: "acceptEdits",
+        enum: ["auto", "acceptEdits", "default", "plan", "bypassPermissions"],
+        default: "auto",
         description:
-          "Permission mode passed via `--permission-mode`. Unknown values silently fall back to `acceptEdits`.",
-        example: "acceptEdits",
+          "Permission mode passed via `--permission-mode`. Unknown values silently fall back to `auto`.",
+        example: "auto",
       },
     },
   },