feat(dsh): adapt to DSH 0.1.5-rc.2 (baseline pin advance, v0.19.1)

The pinned baseline moves to DSH 0.1.5-rc.2 (npm `next`; `latest` is still
rc.1) while the plugin's peer floor stays ^0.1.5-rc.1, so rc.1 hosts need no
DSH upgrade to run this version. Nothing in the rc.1 -> rc.2 delta touches
this plugin: of 300 changed upstream files, the overwhelming majority are
single-line `version` bumps in per-package package.json files, and the only
real code edits are the message-feedback dialog, deliverables card CSS and
the CodeFileIcon SVG artwork split (`code-file-icon-artwork.ts`). There are
zero changes under packages/api|host|session|agent and zero type-surface
changes beyond one line in message-feedback/types.ts, so the adaptation is
the pin itself — devDependencies, the CI mount lane and
SIDEBAR_SERVICE_VERSION — with no plugin-side code change and no runtime
compatibility layer.

- package.json: devDependency pins 0.1.5-rc.1 -> 0.1.5-rc.2 (including
  dsh-client-locale, which is still published on the DSH tuple); peers keep
  the ^0.1.5-rc.1 floor; version -> 0.19.1
- dsh.plugin.json: version -> 0.19.1; engines.dsh keeps >=0.1.5-rc.1 (same
  supported range as the peer floor — the two must not fork)
- pnpm-lock.yaml: lockfile realigned to rc.2
- src/client/service.ts: SIDEBAR_SERVICE_VERSION -> 0.19.1 (tests/service.spec.ts
  asserts it equals package.json's version)

Verified locally on macOS arm64 against the rc.2 tree: pnpm install clean,
`pnpm peers check` reports no peer dependency issues, typecheck / lint /
check:consumer-types green, `pnpm test` 126 files / 1312 passed / 9 skipped.
The real-mount smoke (scripts/e2e-mount.sh with DSH_CMD pinned to rc.2) and
the aggregate double-mount lane both pass — evidence recorded in
docs/plans/2026-09-10-dsh-0.1.5-rc.2-adaptation.md.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dsh-better-sidebar",
-  "version": "0.19.0",
+  "version": "0.19.1",
   "description": "DSH web plugin: a VSCode-like right sidebar (explorer / editor / terminal / git / browser), isolated per conversation session. Exposes a service for other plugins to register sidebar tabs and file viewers.",
   "type": "module",
   "repository": {
@@ -80,6 +80,7 @@
     "watch": "tsdown --watch",
     "prepare": "tsdown",
     "test": "vitest run",
+    "test:windows": "vitest run --maxWorkers=2",
     "test:mount": "bash scripts/e2e-mount.sh",
     "test:mount:aggregate": "bash scripts/e2e-aggregate-mount.sh",
     "clean": "node -e \"require('node:fs').rmSync('lib',{recursive:true,force:true})\"",
@@ -149,29 +150,29 @@
   },
   "devDependencies": {
     "@cordisjs/plugin-loader": "^1.0.0-rc.5",
-    "@deepseek-ai/dsh-agent": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-agent-loop": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-attachment": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-client-locale": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-client-ui-conversation": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-client-ui-primitives": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-client-ui-settings": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-client-ui-sidebar-right": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-client-ui-slots": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-code-runtime": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-host-webserver": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-invariants": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-llm": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-scope": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-session": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-session-persistence": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-session-projection": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-settings": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-subagent": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-system-prompt": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-tools": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-user-approval": "0.1.5-rc.1",
-    "@deepseek-ai/dsh-util-time": "0.1.5-rc.1",
+    "@deepseek-ai/dsh-agent": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-agent-loop": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-attachment": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-client-locale": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-client-ui-conversation": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-client-ui-primitives": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-client-ui-settings": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-client-ui-sidebar-right": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-client-ui-slots": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-code-runtime": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-host-webserver": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-invariants": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-llm": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-scope": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-session": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-session-persistence": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-session-projection": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-settings": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-subagent": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-system-prompt": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-tools": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-user-approval": "0.1.5-rc.2",
+    "@deepseek-ai/dsh-util-time": "0.1.5-rc.2",
     "@huanlin/dsh-plugin-better-locale": "^0.1.0",
     "@playwright/test": "^1.62.1",
     "@shikijs/langs": "^4.3.1",