fix(nav): only the most-specific sidebar item is active

On /career/builder/{id} both "Career Workspace" (/career) and "CV Builder"
(/career/builder) highlighted, because AppShell tested each item with
`pathname === to || pathname.startsWith(to + "/")` — so /career matched
every /career/... child. No "most specific wins" rule.

Add AppShell.activeNavTo(pathname, tos): the longest `to` that the path is
at or under wins, across both nav lists; every other item is inactive. A
child route never lights up a parent nav item. `selected` now compares
against that single computed activeTo. Exported as a pure function so the
ownership rule is unit-tested directly (sidebar-active-nav.test.ts):
exactly one active item for /career, /career/builder and
/career/builder/{id}, and no double-highlight.

Also give the breadcrumb/title in App.tsx explicit /career/builder ->
"CV Builder" ownership (it previously showed "Career Workspace"), and
reframe the Career Workspace header to the "Career Profile" product
framing: "This information powers your CVs, applications, cover letters
and AI assistance."

Frontend only — no change to CareerProfiles, CvVariants, CV generation,
extraction APIs, AI, permissions or tenant isolation. Plan for the deeper
information-architecture work is in docs/career-workspace-ux-refactor.md,
staged so the 1376-line CareerProfilePage and the live CV/extraction
pipeline are refactored incrementally with verification, not in one risky
rewrite.

Verified: tsc clean, frontend build clean, 135 frontend tests pass
(128 + 7 new nav tests). Backend untouched.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

job-tracker-ui/src/App.tsx

@@ -85,6 +85,7 @@ function breadcrumbsFor(path: string, t: (k: any) => string): string[] {
   if (path.startsWith("/trash")) return [t("home"), t("trash")];
   if (path.startsWith("/settings")) return [t("home"), t("settings")];
   if (path.startsWith("/profile")) return [t("home"), t("account"), t("profile")];
+  if (path.startsWith("/career/builder")) return [t("home"), "Career Workspace", "CV Builder"];
   if (path.startsWith("/career")) return [t("home"), "Career Workspace"];
   if (path.startsWith("/settings/connected-accounts")) return [t("home"), t("settings"), "Connected accounts"];
   if (path.startsWith("/admin/audit")) return [t("home"), t("admin"), t("auditLog")];
@@ -104,6 +105,7 @@ function titleFor(path: string, t: (k: any) => string): string {
   if (path.startsWith("/trash")) return t("trash");
   if (path.startsWith("/settings")) return t("settings");
   if (path.startsWith("/profile")) return t("profile");
+  if (path.startsWith("/career/builder")) return "CV Builder";
   if (path.startsWith("/career")) return "Career Workspace";
   if (path.startsWith("/settings/connected-accounts")) return "Connected accounts";
   if (path.startsWith("/admin/audit")) return t("auditLog");

job-tracker-ui/src/layout/AppShell.tsx

@@ -47,6 +47,20 @@ function initialsFrom(s?: string) {
 
 const DESKTOP_SIDEBAR_KEY = "appShellDesktopSidebarCollapsed";
 
+// Which single nav item owns the current path. A child route must not light up its parent:
+// /career/builder/5 belongs to "CV Builder" (/career/builder), not "Career Workspace" (/career),
+// even though the old `pathname.startsWith(to + "/")` test matched both. Explicit ownership =
+// the LONGEST `to` that the path is at or under wins; everything else is inactive. Exported so the
+// rule is unit-testable without rendering the shell.
+export function activeNavTo(pathname: string, tos: string[]): string | null {
+  let best: string | null = null;
+  for (const to of tos) {
+    const owns = pathname === to || pathname.startsWith(to + "/");
+    if (owns && (best === null || to.length > best.length)) best = to;
+  }
+  return best;
+}
+
 // The nav rail stays a fixed dark navy regardless of the app's light/dark theme toggle --
 // a deliberate signature element, not derived from theme tokens.
 const SIDEBAR_BG = "#0f172a";
@@ -129,6 +143,12 @@ export default function AppShell({
     };
   }, [nav, navBottom]);
 
+  // Compute the one active destination across BOTH nav lists, so the most specific route wins.
+  const activeTo = useMemo(
+    () => activeNavTo(pathname, [...nav, ...navBottom].map((i) => i.to)),
+    [pathname, nav, navBottom],
+  );
+
   const renderNavList = (groups: Array<[string, NavItem[]]>) => (
     <Box sx={{ px: desktopNavCollapsed ? 0.75 : 1.25, pt: 1 }}>
       {groups.map(([section, rows]) => (
@@ -140,7 +160,7 @@ export default function AppShell({
           ) : null}
           <List sx={{ px: desktopNavCollapsed ? 0.25 : 0.75, pt: desktopNavCollapsed ? 0.25 : 0.75 }}>
             {rows.map((item) => {
-              const selected = pathname === item.to || pathname.startsWith(item.to + "/");
+              const selected = item.to === activeTo;
               return (
                 <ListItemButton
                   key={item.to}

job-tracker-ui/src/sidebar-active-nav.test.ts

@@ -0,0 +1,43 @@
+import { activeNavTo } from "./layout/AppShell";
+
+// Route ownership under test (the real sidebar entries):
+//   /career          -> Career Workspace
+//   /career/builder  -> CV Builder
+// A child route must activate exactly one nav item — the most specific owner.
+const TOS = ["/dashboard", "/jobs", "/career", "/career/builder", "/settings"];
+
+describe("sidebar active nav ownership", () => {
+  test("/career activates Career Workspace only", () => {
+    expect(activeNavTo("/career", TOS)).toBe("/career");
+  });
+
+  test("/career/builder activates CV Builder only, not Career Workspace", () => {
+    expect(activeNavTo("/career/builder", TOS)).toBe("/career/builder");
+  });
+
+  test("/career/builder/{id} activates CV Builder only (the reported bug)", () => {
+    // Previously /career matched via startsWith('/career/') AND /career/builder matched — both lit up.
+    expect(activeNavTo("/career/builder/42", TOS)).toBe("/career/builder");
+  });
+
+  test("a plain child of /career (not /builder) still belongs to Career Workspace", () => {
+    expect(activeNavTo("/career/anything-else", TOS)).toBe("/career");
+  });
+
+  test("unrelated routes are unaffected and exact matches win", () => {
+    expect(activeNavTo("/jobs", TOS)).toBe("/jobs");
+    expect(activeNavTo("/settings/connected-accounts", TOS)).toBe("/settings");
+  });
+
+  test("a path owned by no nav item activates nothing", () => {
+    expect(activeNavTo("/admin/system", TOS)).toBeNull();
+  });
+
+  test("exactly one item is ever active (no double highlight)", () => {
+    for (const path of ["/career", "/career/builder", "/career/builder/7", "/jobs"]) {
+      const active = activeNavTo(path, TOS);
+      const matches = TOS.filter((t) => t === active);
+      expect(matches).toHaveLength(1);
+    }
+  });
+});

job-tracker-ui/src/views/CareerWorkspacePage.tsx

@@ -15,15 +15,15 @@ export default function CareerWorkspacePage() {
     <Box sx={{ display: "grid", gap: 2 }}>
       <Paper sx={{ p: 2.5, borderRadius: 4, boxShadow: "0px 8px 24px -12px rgba(15,23,42,0.12)", display: "flex", alignItems: "center", justifyContent: "space-between", flexWrap: "wrap", gap: 1 }}>
         <Box>
-          <Typography variant="h5" sx={{ fontWeight: 900, mb: 0.5 }}>Career Workspace</Typography>
+          <Typography variant="h5" sx={{ fontWeight: 900, mb: 0.5 }}>Career Profile</Typography>
           <Typography sx={{ color: "text.secondary" }}>
-            Maintain the master career profile that powers your CVs, tailored application material, and future portfolio outputs.
+            This information powers your CVs, applications, cover letters and AI assistance.
           </Typography>
         </Box>
         <Button variant="contained" startIcon={<DescriptionOutlinedIcon />} onClick={() => navigate("/career/builder")}>Open CV Builder</Button>
       </Paper>
       <Alert severity="info" sx={{ borderRadius: 3 }}>
-        Your master profile is the source of truth. Job-specific CV drafts remain separate and never overwrite it.
+        Your career profile holds your information. The CV Builder creates documents from it — job-specific CVs stay separate and never overwrite your profile.
       </Alert>
       <Paper sx={{ borderRadius: 4, p: { xs: 1.5, md: 2.5 }, boxShadow: "0px 8px 24px -12px rgba(15,23,42,0.12)" }}>
         <CareerProfilePage />