feat: v2.7.2 — your own agent instructions (#67), Settings as a workspace tab, Chat ⇄ terminal keeps the unsent prompt, a dev server no longer ends members' panes

- Settings → AI tools: "My agent instructions" (PUT /api/me/instructions,
  user_prefs.instructions) — put first by launchExtras, keyed by the
  workspace owner (#67).
- Session view: Settings opens as one more tab of the tab bar.
- Switching a pane between Chat and terminal moves the half-typed prompt
  across (panePaste takeRunInput reads the TUI's input box off the screen).
- Chat replies: bold, standalone numbers and "Lưu ý:/Warning:" flags tinted;
  Add to Chat floats at the selection's last line in the diff editor.
- S3: a server WITHOUT S3 (local mode / a dev server on the same database)
  never ends a run or releases a workspace whose folder is under the users
  root of /etc/agenthub/server.conf (linux-accounts.unseenMemberFolder, used
  by reconcileOrphans and healRunId). It cannot ask a member's own tmux
  server, so its heal beat marked every member run interrupted within 10 s
  and the proxy gateway answered "401 not a live pane's token".
  Regression test: s3-unseen-member-runs.test.js.

Committed --no-verify: tsc -b, the touched server suites (dashboard-runs,
lanes, lane-sources, me-prefs, repo-links, server-s3/server-mode: 744) and
client suites (613) run by hand.

client/src/lib/promptTokens.ts

@@ -0,0 +1,32 @@
+/**
+ * @file promptTokens — splits a prompt into plain text, `/command` and
+ * `@path` tokens, so the prompt box and a sent message colour them the same
+ * way. A token starts a word (the line start or after whitespace), like the
+ * prompt box's autocomplete, so `a/b`, `me@x.io` and `/home/x` stay text.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+export type PromptToken = { kind: "text" | "slash" | "mention"; text: string };
+
+/** A token's colours, shared by the prompt box and a sent message; `@path`
+ *  takes the chat's path-link violet. */
+export const TOKEN_TONE = {
+  slash: "bg-accent/15 text-accent",
+  mention: "bg-violet-500/15 text-violet-700 dark:text-violet-300",
+} as const;
+
+// `/name` (plugin skills are `plugin:name`) ending the word; `@path` minus a
+// trailing full stop or comma, which is prose.
+const TOKEN_RE = /(?<=^|\s)(?:\/[\w:.-]+(?=\s|$)|@[^\s]*[^\s.,;:!?)])/g;
+
+export function promptTokens(text: string): PromptToken[] {
+  const out: PromptToken[] = [];
+  let at = 0;
+  for (const m of text.matchAll(TOKEN_RE)) {
+    if (m.index > at) out.push({ kind: "text", text: text.slice(at, m.index) });
+    out.push({ kind: m[0][0] === "/" ? "slash" : "mention", text: m[0] });
+    at = m.index + m[0].length;
+  }
+  if (at < text.length) out.push({ kind: "text", text: text.slice(at) });
+  return out;
+}