docs: HISTORY + README track the v0.42.0 brand refresh

- HISTORY.md: 'Release Image' section with the Doing my part image
  (img/doingmypart.jpg) under the latest entry; the release image
  the new Brand module + app-primitives UI kit is going out with.
- README.md: 'BillTracker' -> 'Bill Tracker' (with the space) so
  the product name in the docs matches BRAND.name on the live site.

This is commit 9 of 9 in the v0.42.0 brand refresh. Docs-only; no
code change. Depends on 8ceea06 (lib).

HISTORY.md

@@ -162,6 +162,12 @@
 - `tests/categoryGroups.test.js` — 4 tests: create/list/rename/delete, duplicate name rejection, group ownership validation, category assignment
 - `tests/spendingSummary.test.js` — 4 tests: budgeted category with no activity, non-spending category bundling, 3-month average calculation, category groups in response
 
+### Release Image
+
+![Doing my part](/img/doingmypart.jpg)
+
+---
+
 ## v0.38.4
 
 ### ✨ Money

README.md

@@ -1,10 +1,10 @@
-# BillTracker
+# Bill Tracker
 
 <p align="center">
-  <img src="docs/images/logo_cut.png" alt="BillTracker logo">
+  <img src="docs/images/logo_cut.png" alt="Bill Tracker logo">
 </p>
 
-BillTracker is a private, self-hosted bill planning app for households and
+Bill Tracker is a private, self-hosted bill planning app for households and
 personal finance setups. It tracks recurring bills, monthly cash buckets,
 payments, due dates, categories, subscriptions, bank-synced transactions,
 imports, exports, backups, and debt payoff plans from one local installation.
@@ -55,7 +55,7 @@ Screenshots below were refreshed from the linked demo server.
 
 ## Who This Is For
 
-BillTracker is built for self-hosters who want a practical bill dashboard
+Bill Tracker is built for self-hosters who want a practical bill dashboard
 without sending personal finance data to a hosted budgeting product.
 
 Good fit:
@@ -75,7 +75,7 @@ Not a replacement for:
 - Tax software
 - Direct bank connectivity without SimpleFIN
 
-Bank sync requires a SimpleFIN Bridge account. BillTracker consumes SimpleFIN
+Bank sync requires a SimpleFIN Bridge account. Bill Tracker consumes SimpleFIN
 data; it does not host SimpleFIN server endpoints or connect directly to banks.
 
 ## Quick Start With Docker
@@ -126,7 +126,7 @@ financial data.
 
 ### HTTPS And Cookies
 
-Run BillTracker behind HTTPS for normal use. If TLS terminates at a reverse
+Run Bill Tracker behind HTTPS for normal use. If TLS terminates at a reverse
 proxy, forward:
 
 ```text
@@ -296,7 +296,7 @@ Worker status and recent activity are visible from Admin/Status.
 
 ## Privacy Model
 
-BillTracker is intended to run privately in your own environment.
+Bill Tracker is intended to run privately in your own environment.
 
 - Bill data stays in your SQLite database.
 - The app does not use third-party analytics, advertising, or telemetry.
@@ -309,7 +309,7 @@ backups, but normal bill data is scoped to the signed-in user.
 
 ## Authentication
 
-BillTracker supports local username/password login by default. Admins can create
+Bill Tracker supports local username/password login by default. Admins can create
 users, reset passwords, promote or demote users, and activate or deactivate
 accounts.