feat: adapt to DSH 0.1.7-rc.1

Move the support line from 0.1.7-alpha.1 to 0.1.7-rc.1 (peer floor
`^0.1.7-rc.1`). 0.21.0-alpha.1 never reached npm, and once the code-card
labels below are fixed the same build crashes on alpha.1 (its DiffBlock
still reads the `labels.files` upstream deleted), so declaring only the
host we verify against is the honest floor — and from rc.1 on the host
enforces peers at boot anyway: a row whose `@deepseek-ai/dsh-*` peers do
not satisfy the runtime is silently disabled.

Dependencies: 28 devDependency pins and 14 peers move to 0.1.7-rc.1.
rc.1 also raised the vendored runtime (cordis 4.0.4, schemastery 3.18.4,
cordis-plugin-group 1.0.4, cordis-plugin-include 1.0.9) and publishes DSH
cross-references as exact versions, so bumping schemastery/cordis alone
left four unmet transitive peers — the three vendor packages are hoisted
into devDependencies, which is what makes `pnpm peers check` clean again.

One compile break: rc.1 added `CodeToolbarLabels` (codeLabel / wrapLabel /
unwrapLabel, all required), made DiffBlockLabels / ReadBlockLabels extend
it and deleted `DiffBlockLabels.files`. Fixing SideChatView then leaving
markdown on the legacy banner would render two different code-card styles
inside one side-chat view, so the plugin adopts the card everywhere:
`markdownTextProps()` now passes `labels.code.toolbarLabels` with the
host's own wording (codeBlock.title|wrap|unwrap, added to all 20
dictionaries; `sideChatBlockFiles` retires with the deleted footer).

Adopting the card surfaced a silent regression the suite caught: the new
toolbar shows `codeLabel` for languages the highlighter does not know, and
mermaid has no shiki grammar, so the info string no longer reaches the DOM
and the banner-text probe in mermaid.tsx matched nothing — mermaid fences
stopped being swapped for diagrams. Detection now matches the FENCE BODY
from the source that produced the render.

`tests/market-manifest.spec.ts` pins every DSH peer as a floating caret
range: an exact pin (the devDependency style) or a comparator without a
prerelease would fail rc.1's preflight and silently stop the plugin from
loading, and `pnpm peers check` cannot see that — it validates the
resolved dev tree, not the range shape the host reads.

src/client/markdown-labels.tsx

@@ -1,5 +1,5 @@
 /**
- * Copy-button / chrome labels for DSH's shared `MarkdownText` (DSH
+ * Chrome labels for DSH's shared `MarkdownText` (DSH
  * 0.1.2-alpha contract): the renderer takes a REQUIRED nested `labels` prop
  * — `labels.code.copyLabel` / `labels.code.copiedLabel` for the fence copy
  * buttons plus a screen-reader-only `labels.footnotes` heading — and the
@@ -8,15 +8,29 @@
  * dictionary's localized pair through here (re-evaluated per render).
  * `footnotes` is left empty (the heading is sr-only; give it a real string
  * only if a locale key ever earns its place in all 19 dictionaries).
+ *
+ * DSH 0.1.7-rc.1 added `labels.code.toolbarLabels` (language name + wrap
+ * toggle + copy). Supplying it is what swaps the legacy info-string banner for
+ * the host's code card, and the three strings are REQUIRED once supplied, so
+ * every site that builds the flat pair has to carry them too — the code card
+ * must look the same in the transcript, the diff card and the editor preview as
+ * it does in DSH's own chat.
  */
 import type { ComponentProps } from 'react'
 import { MarkdownText } from '@deepseek-ai/dsh-client-ui-primitives'
 
-/** The flat copy-button pair the plugin threads through its own props (e.g.
- *  MermaidMarkdownProps.codeLabels — the chunk contract stays put). */
+/** The code-card chrome the plugin threads through its own props (e.g.
+ *  MermaidMarkdownProps.codeLabels — the chunk contract carries the same
+ *  fields). */
 export interface MarkdownCopyLabels {
   copyLabel: string
   copiedLabel: string
+  /** Code-card title for an absent or unsupported language. */
+  codeLabel: string
+  /** Code-card action that enables wrapping. */
+  wrapLabel: string
+  /** Code-card action that preserves source columns with horizontal scrolling. */
+  unwrapLabel: string
 }
 
 /** MarkdownText props carrying the nested chrome labels. */
@@ -24,7 +38,15 @@ export function markdownTextProps(text: string, labels: MarkdownCopyLabels): Com
   return {
     text,
     labels: {
-      code: { copyLabel: labels.copyLabel, copiedLabel: labels.copiedLabel },
+      code: {
+        copyLabel: labels.copyLabel,
+        copiedLabel: labels.copiedLabel,
+        toolbarLabels: {
+          codeLabel: labels.codeLabel,
+          wrapLabel: labels.wrapLabel,
+          unwrapLabel: labels.unwrapLabel,
+        },
+      },
       footnotes: '',
     },
   }