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/TerminalView.tsx

@@ -666,8 +666,12 @@ export const TerminalView = memo(function TerminalView({
     () =>
       registerPane(
         runId,
-        (text, submit) => {
-          termRef.current?.paste(text);
+        (text, submit, files = []) => {
+          const term = termRef.current;
+          // The text, then each image's path in a paste of its own — the one
+          // shape `claude` turns into `[Image #n]` on every platform.
+          if (text) term?.paste(files.length ? `${text} ` : text);
+          files.forEach((f, i) => term?.paste(i < files.length - 1 ? `${f} ` : f));
           // Enter a beat after the paste, so a TUI that times its paste
           // detection never reads it as a newline inside the paste. A submit
           // comes from the pane's Chat view, which keeps the keyboard.