chore: prepare v4.0.2 release

- Update RELEASE_NOTES.md and CHANGELOG.md for v4.0.2.
- Hide in-development 'Compare Mode' toolbar icon.
- Specialize GitHub issue templates for QuickView hardware/image environment (English only).

Author: justnullname

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,8 +1,8 @@
 ---
-name: Bug report
-about: Create a report to help us improve
-title: ''
-labels: ''
+name: 🐛 Bug Report
+about: Create a report to help us improve the project
+title: '[BUG] '
+labels: bug
 assignees: ''
 
 ---
@@ -12,27 +12,29 @@ A clear and concise description of what the bug is.
 
 **To Reproduce**
 Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-3. Scroll down to '....'
-4. See error
+1. Open image '...'
+2. Perform action '....'
+3. See error
 
 **Expected behavior**
 A clear and concise description of what you expected to happen.
 
 **Screenshots**
 If applicable, add screenshots to help explain your problem.
 
-**Desktop (please complete the following information):**
- - OS: [e.g. iOS]
- - Browser [e.g. chrome, safari]
- - Version [e.g. 22]
+**Environment Information (CRITICAL)**
+ - **QuickView Version**: [e.g. v4.0.2]
+ - **OS Version**: [e.g. Windows 11 23H2 Build 22631]
+ - **CPU**: [e.g. AMD Ryzen 9 7950X - Used for SIMD/AVX check]
+ - **GPU**: [e.g. NVIDIA RTX 4090 - Used for Direct2D/DirectCompute]
+ - **RAM**: [e.g. 32GB]
+ - **Display**: [e.g. 4K 150% Scale - Used for High-DPI layout check]
 
-**Smartphone (please complete the following information):**
- - Device: [e.g. iPhone6]
- - OS: [e.g. iOS8.1]
- - Browser [e.g. stock browser, safari]
- - Version [e.g. 22]
+**Image Information**
+ - **Format**: [e.g. JXL, AVIF, RAW, Giga-pixel JPG]
+ - **Resolution**: [e.g. 30,000 x 20,000 - Did it trigger Titan engine?]
+ - **File Size**: [e.g. 500MB]
 
 **Additional context**
-Add any other context about the problem here.
+Add any other context about the problem here (e.g. customized QuickView.ini settings).
+```

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,20 +1,20 @@
 ---
-name: Feature request
+name: ✨ Feature Request
 about: Suggest an idea for this project
-title: ''
-labels: ''
+title: '[FEAT] '
+labels: enhancement
 assignees: ''
 
 ---
 
 **Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+A clear and concise description of what the problem is.
 
 **Describe the solution you'd like**
 A clear and concise description of what you want to happen.
 
-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
+**Technical Note (Optional)**
+If you have ideas on SIMD optimization (AVX2/512), Direct2D transforms, or Titan engine integration.
 
 **Additional context**
 Add any other context or screenshots about the feature request here.

CHANGELOG.md

@@ -1,5 +1,24 @@
 # Changelog
 
+## [4.0.2] - Performance & Precision Refinement
+**Release Date**: 2026-03-10
+
+### ✨ Features & UX
+- **Smart Zoom Toggle**: Implemented a 3-state toggle (Initial -> Fit Screen -> 100%) for intuitive scaling control.
+- **Window Management**: Fixed "creeping" window bug on systems with top taskbars (#26).
+- **HUD Gallery**: Resolved thumbnail desync issues after image deletion (#21).
+- **Settings**: Support for dragging the Settings Window and fixed combobox resizing metrics.
+
+### ⚡ Performance & Titan
+- **Titan Optimization**: Improved tile triggering logic by removing threshold quantization.
+- **Wait Cursor**: Eliminated unnecessary OS wait cursor during prefetch operations.
+- **UI Performance**: Fixed progress bar rendering overhead and eliminated exit stutter when using `Esc`.
+
+### 🐛 Bug Fixes
+- **SVG Engine**: Fixed random disappearance of SVG nodes during dynamic scaling.
+- **Format Support**: Removed unsupported `.raw` format to prevent navigation lag and decoding failures.
+- **Layout**: Refined font sizes and spacing for improved system consistency.
+
 ## [4.0.0] - The Titan Engine Update
 **Release Date**: 2026-03-06
 

QuickView/Toolbar.cpp

@@ -45,17 +45,17 @@ Toolbar::Toolbar() {
         { ToolbarButtonID::FixExtension, ICON_WARNING[0], {}, false, false, true }, // Hidden if no mismatch
 
         { ToolbarButtonID::Pin,         ICON_PIN[0], {}, true, false },
-        { ToolbarButtonID::CompareToggle, ICON_COMPARE[0], {}, true, false },
+        // { ToolbarButtonID::CompareToggle, ICON_COMPARE[0], {}, true, false },
 
         // Compare mode buttons (hidden in normal mode)
-        { ToolbarButtonID::CompareSwap, ICON_SWAP[0], {}, true, false },
-        { ToolbarButtonID::CompareLayout, ICON_LAYOUT[0], {}, true, false },
-        { ToolbarButtonID::CompareInfo, ICON_INFO[0], {}, true, false },
-        { ToolbarButtonID::CompareDeleteLeft, ICON_DELETE[0], {}, true, false },
-        { ToolbarButtonID::CompareDeleteRight, ICON_DELETE[0], {}, true, false },
-        { ToolbarButtonID::CompareSyncZoom, ICON_LINK[0], {}, true, true },
-        { ToolbarButtonID::CompareSyncPan, ICON_PAN[0], {}, true, true },
-        { ToolbarButtonID::CompareExit, ICON_EXIT[0], {}, true, false }
+        // { ToolbarButtonID::CompareSwap, ICON_SWAP[0], {}, true, false },
+        // { ToolbarButtonID::CompareLayout, ICON_LAYOUT[0], {}, true, false },
+        // { ToolbarButtonID::CompareInfo, ICON_INFO[0], {}, true, false },
+        // { ToolbarButtonID::CompareDeleteLeft, ICON_DELETE[0], {}, true, false },
+        // { ToolbarButtonID::CompareDeleteRight, ICON_DELETE[0], {}, true, false },
+        // { ToolbarButtonID::CompareSyncZoom, ICON_LINK[0], {}, true, true },
+        // { ToolbarButtonID::CompareSyncPan, ICON_PAN[0], {}, true, true },
+        // { ToolbarButtonID::CompareExit, ICON_EXIT[0], {}, true, false }
     };
 }
 

RELEASE_NOTES.md

@@ -1,26 +1,20 @@
-# QuickView v4.0.0 - The Titan Engine Update
-**Release Date**: 2026-03-06
+# QuickView v4.0.2 - Performance & Stability Fixes
+**Release Date**: 2026-03-10
 
-This is a massive milestone release focusing on the introduction of the **Titan Architecture**, full **JPEG XL** integration, and **Gigapixel Image Handling**.
+This update focuses on refining the **Titan Engine** performance, optimizing **UX interaction**, and fixing several critical bugs discovered after the v4.0.0 milestone.
 
-### 🚀 Architecture: "Titan System"
--   **Gigapixel Tiling**: The new Titan Pipeline dynamically slices massive image datasets into manageable LOD (Level of Detail) tiles, enabling smooth 60fps panning over images that previously caused OOM (Out of Memory) crashes.
--   **Smart Pull & Prefetch**: Memory is now intelligently streamed. QuickView only decodes and uploads the tiles currently visible on your monitor, predicting panning direction to prefetch adjacent chunks.
--   **Direct-to-MMF Decode**: Zero-copy Memory-Mapped File strategy to pipeline gigantic source images directly to the render composition engine.
+### ⚡ UX & Interaction
+-   **Smart 3-State Zoom**: Re-engineered the zoom toggle logic. Clicking now cycles through `Initial` -> `Fit Screen` -> `100%`, providing much smoother control over image sizing.
+-   **No-Stutter Exit**: Solved the annoying window stutter/lag that occurred when closing the application via the `Esc` key.
 
-### ✨ Format Enhancements
--   **Native JPEG XL (JXL)**: Full, hyper-optimized support for the next-generation JXL format, backed by our parallel HeavyLane workers.
--   **Pro Design Formats**: We now support Photoshop's massive document format (PSB) and can instantly extract embedded previews from both PSDs and PSBs.
--   **Shell-Accelerated Gallery**: The `T` Gallery now taps directly into the Windows Explorer Thumbnail Cache, making initial indexing of massive folders completely instantaneous.
+### 🚀 Titan Engine Refinements
+-   **Wait Cursor Fix**: Corrected logic where the OS wait cursor would incorrectly flicker during background prefetching.
+-   **Tile Triggering**: Optimized Titan tile activation by removing threshold quantization, ensuring seamless LOD transitions even for ultra-narrow images.
+-   **Progress UI**: Enhanced the Titan loading progress bar for better visual performance and accuracy.
 
-### 💎 UX & Scaling
--   **True PerMonitorV2 High-DPI**: The interface has been untethered from Windows' legacy scaling. We now support explicit native UI scaling with granular manual overrides (100%-250%).
--   **Always Fullscreen**: A much-requested feature—you can now command QuickView to automatically launch images in exclusive Fullscreen mode (`Off`, `Large Only`, `All`).
--   **Wheel Action Customization**: Unified and centralized logic for mouse-wheel actions with a new `WheelActionMode` for absolute control.
+### 🛠 Stability & Fixes
+-   **SVG Scaling**: Fixed a bug where SVGs would randomly disappear when scaling at certain factors.
+-   **Window Snap**: Resolved an issue where the window would creep downwards on systems with top-aligned taskbars.
+-   **Gallery Sync**: Fixed HUD Gallery thumbnail desync when deleting images while the gallery is open.
 
-### 🛠 Visual Precision
--   **AVX-512 SIMD Resizing**: Critical bilinear scaling paths have been unrolled using the latest AVX2/AVX-512 instruction sets for blazing-fast zooming.
--   **Center-to-Center Topology**: Our internal rendering coordinate system was mathematically refactored, permanently eliminating "edge smearing" and pixel gaps between Titan tiles.
--   **Focus Robustness**: Implemented low-level `AttachThreadInput` logic to guarantee new QuickView windows forcefully seize focus when you open new files from Explorer.
-
----
+---