perf: faster plugin updates, half-size first bundle, images from the chat attach on Windows

- Chat view: an attached image's path is pasted on its own after the text
  (promptForPane). claude turns a paste that is only an image path into
  [Image #n], but left a Windows path inside a paste of text as a plain path.
  Other files and @-mentions stay in the text as before.
- Plugin bootstrap: depsHash covers only what npm installs (no release
  version), so a version bump no longer reinstalls runtime deps; the client's
  installed tree is kept while its manifests are unchanged (no npm ci per
  update); the user-side build runs vite only (tsc -b cost ~25 s / ~900 MB);
  clientBuild is recorded only after a build that did not fail, so a failed
  one is retried; npm output goes to runtime/npm-install.log.
- Server: a port held by another program ends with a clear message and exit 1
  instead of an uncaught 'error' stack trace.
- Client: the onboarding wizard is lazy and rendered only before onboarding;
  usePrefersReducedMotion moved to hooks/ so PetSettings no longer pulls the
  Sagi chat/pane stack into the entry chunk (884 KB -> 431 KB, gzip 268 -> 133 KB).

client/src/components/run/PaneChat.tsx

@@ -59,7 +59,13 @@ import { useTranslation } from "react-i18next";
 import { ArrowUp, FileText, Square, SquareCheck } from "lucide-react";
 import { isSubmitEnter } from "../../lib/keys";
 import { ConversationView } from "../conversation/ConversationView";
-import { ModelMenu, PromptEditor, promptWithImages, type PromptImage } from "./RunSetup";
+import {
+  ModelMenu,
+  PromptEditor,
+  promptForPane,
+  promptWithImages,
+  type PromptImage,
+} from "./RunSetup";
 import { ChatAddMenu } from "./ChatAddMenu";
 import { addAttachments, dragAttachments } from "../../lib/promptAttach";
 import { readChatDraft, writeChatDraft } from "../../lib/chatDraft";
@@ -491,7 +497,7 @@ export const PaneChat = memo(function PaneChat({
   const [notStarted, setNotStarted] = useState(false);
 
   // A control is a command typed into the pane, like the user would.
-  const command = async (line: string) => {
+  const command = async (line: string, files: string[] = []) => {
     if (
       notStarted &&
       !(await confirmDialog({
@@ -501,14 +507,15 @@ export const PaneChat = memo(function PaneChat({
       }))
     )
       return false;
-    const ok = submitToRun(runId, line);
+    const ok = submitToRun(runId, line, files);
     if (!ok) toast.error(t("chat.notSent"));
     return ok;
   };
 
   const send = async () => {
     if (!text || uploading) return;
-    if (!(await command(text))) return;
+    const out = promptForPane(prompt, images);
+    if (!(await command(out.text, out.files))) return;
     setFollow((n) => n + 1);
     setPrompt("");
     images.forEach((i) => i.url && URL.revokeObjectURL(i.url));