Prepare v2.4.0 release notes

Finalize the CHANGELOG [Unreleased] section as [2.4.0]: the Viewer D-key
preset-resolution cycling, the steady-window folder navigation fix, the
refreshed app icons / Microsoft Store tile assets, and the Qt viewer test
harness and build docs. Release CI extracts this section verbatim as the
GitHub release body and the Store "What's New".

Also refresh the Store listing (add the N/D cycling feature, drop the stale
1.0.x release-note placeholder) and bring the Store submission guide's example
versions up to the current 2.4 series.

Author: chammoru

CHANGELOG.md

@@ -8,24 +8,36 @@ the [GitHub Releases page](https://github.com/chammoru/Q1View/releases).
 
 ## [Unreleased]
 
+---
+
+## [2.4.0] — 2026-06-13
+
 ### Added
 - Viewer: press `D` to cycle through the preset resolutions for raw input,
   mirroring how `N` advances the color space. The shortcut is ignored for
   sources with an intrinsic size (decoded images and video).
+
+### Fixed
+- Viewer: stepping through a folder with PgUp/PgDn (and Home/End) no longer
+  resizes the window around each image. The window keeps its size and the next
+  image is fit into the existing viewport, so browsing mixed-resolution folders
+  stays steady instead of jumping between sizes and in/out of a maximized frame.
+  A fresh open still sizes the window to the image. Fit now shrinks large images
+  to fit but never upscales past 1:1, so small images stay crisp at 100%.
+
+### Packaging
+- Refreshed the Viewer and Comparator application icons and the Microsoft Store
+  tile and logo assets, regenerated per size from vector masters for sharper,
+  more consistent edges at every scale.
+
+### Developer
 - Qt viewer: a `--selftest` mode plus committed raw-format fixtures and a
   headless smoke check. `viewer-qt.yml` now runs `ctest` after the build,
   opening each fixture (yuv420, nv12, nv21, yuv420p10le, p010, grayscale,
   rgb888, bgr888, rgba8888, bgr565) under the offscreen QPA platform on
   Linux/macOS/Windows.
-
-### Fixed
-- Viewer (MFC and Qt): stepping through a folder with PgUp/PgDn (and
-  Home/End) no longer resizes the window around each image. The window keeps
-  its size and the next image is fit into the existing viewport, so browsing
-  mixed-resolution folders stays steady instead of jumping between sizes and
-  in/out of a maximized frame. A fresh open still sizes the window to the
-  image. Fit now shrinks large images to fit but never upscales past 1:1, so
-  small images stay crisp at 100%.
+- Documented the experimental Qt viewer build and its `qtmultimedia`
+  requirement in the development guide.
 
 ---
 
@@ -305,7 +317,8 @@ the [GitHub Releases page](https://github.com/chammoru/Q1View/releases).
 
 ---
 
-[Unreleased]: https://github.com/chammoru/Q1View/compare/v2.3.1...HEAD
+[Unreleased]: https://github.com/chammoru/Q1View/compare/v2.4.0...HEAD
+[2.4.0]: https://github.com/chammoru/Q1View/compare/v2.3.1...v2.4.0
 [2.3.1]: https://github.com/chammoru/Q1View/compare/v2.3.0...v2.3.1
 [2.3.0]: https://github.com/chammoru/Q1View/compare/v2.2.0...v2.3.0
 [2.2.0]: https://github.com/chammoru/Q1View/compare/v2.1.0...v2.2.0

docs/STORE_LISTING.md

@@ -80,6 +80,7 @@ TECHNICAL NOTES
 13. Rotation, luma-only view, interpolation, and hex pixel value modes
 14. Allow Different Resolution mode for cross-resolution comparisons
 15. Portable ZIP available alongside the installer
+16. Cycle raw color space (N) and preset resolutions (D) without reopening the file
 ```
 
 ---
@@ -101,12 +102,15 @@ TECHNICAL NOTES
 ## Release notes template (for each update)
 
 ```
-v1.0.XX
+vX.Y.Z
 
 See the full changelog at:
 https://github.com/chammoru/Q1View/blob/master/CHANGELOG.md
 ```
 
+Release CI fills in the actual "What's New" automatically from the matching
+`CHANGELOG.md` section, so this template is only a manual fallback.
+
 ---
 
 ## Support information

docs/STORE_SUBMISSION.md

@@ -32,7 +32,7 @@ msbuild Comparator\Comparator.sln /m /restore /p:Configuration=Release /p:Platfo
 # 3. Create and sign MSIX
 #    Publisher must exactly match your Partner Center certificate Subject.
 .\build\Package-Q1ViewMsix.ps1 `
-    -AppVersion 1.0.16.0 `
+    -AppVersion 2.4.0.0 `
     -Publisher "CN=A89D24B3-A271-4AE1-9B9E-BFAE414EB0C6"
 ```
 
@@ -129,7 +129,7 @@ For source media and redistribution notes, see `docs/IMAGE_SOURCES.md`.
 - [ ] Upload `dist\Q1View-windows-x64.msix`
 - [ ] Confirm package details in Partner Center match the manifest:
   - Publisher CN matches certificate
-  - Version matches the release tag (e.g. `1.0.16.0`)
+  - Version matches the release tag (e.g. `2.4.0.0`)
   - Viewer appears as the Store entry point and can launch the included Comparator workflow
 
 ### 7. Final review and submit
@@ -159,8 +159,8 @@ identified issue, rebuild the MSIX, and resubmit.
 
 For subsequent releases:
 
-1. Increment the version in the tag (e.g. `v1.0.17`).
-2. Rebuild and sign the MSIX with the new version (`1.0.17.0`).
+1. Increment the version in the tag (e.g. `v2.4.1`).
+2. Rebuild and sign the MSIX with the new version (`2.4.1.0`).
 3. In Partner Center, open the existing app → **Update** → upload the new package.
 4. Update the Store listing description and release notes.
 5. Submit.