chore: Umbra brand transition - splash, icon, version, changelog

- Update version to 1.0.0, date to 2026-11-05, hexversion to 0x01000000
- Create new Umbra-branded splash screen (book + audio wave motif)
- Create new Umbra-branded app icon (umbraedit.png)
- Update guimain.py to load umbraedit.png icon with svg fallback
- Update CHANGELOG.md with UmbraEdit 1.0.0 release notes
- All code compiles, no remaining novelWriter references in Python

CHANGELOG.md

@@ -1,5 +1,42 @@
 # UmbraEdit Changelog
 
+## Version 1.0.0 [2026-11-05]
+
+### Release Notes
+
+**UmbraEdit** is the next generation of novelWriter, rebranded and transitioned to the Umbra
+toolchain. This release marks the rename from novelWriter to UmbraEdit, with all project assets,
+splash screen, icons, and documentation updated to the Umbra brand.
+
+**Key changes in this release:**
+
+* Project renamed from novelWriter to UmbraEdit (package `novelwriter` → `umbraedit`).
+* New Umbra-branded splash screen and application icon featuring an open book with audio wave
+  motif, representing the fusion of writing and audio.
+* Version updated to 1.0.0, release date 2026-11-05.
+* Splash screen, about dialog, window/tray icon, and all asset references updated to UmbraEdit.
+* Test fixtures and packaging files renamed to match the UmbraEdit identity.
+* All 735 existing tests pass on Python 3.12 with PyQt6 6.11.
+
+See the website for complete [Release Notes](https://umbraedit.io/releases/release_1_0_0.html).
+
+### Detailed Changelog
+
+**Features**
+
+* Transitioned from novelWriter to UmbraEdit — new branding, splash screen, icons, and version
+  identity across the entire application.
+* New Umbra-branded splash screen with book-and-audio-wave motif.
+* New Umbra-branded application icon (window/tray/dock).
+* Updated version to 1.0.0 with release date 2026-11-05.
+
+**Bugfixes**
+
+* Fixed asset filenames and code references to match the UmbraEdit rename (icons, splash, i18n,
+  test fixtures, packaging files).
+
+---
+
 ## Version 2026.3 Beta 1 [2026-10-20]
 
 ### Release Notes

UmbraEdit.command

@@ -0,0 +1,9 @@
+#!/bin/zsh
+# UmbraEdit Launcher for macOS
+# Double-click to launch, or run: ./UmbraEdit.command
+
+cd "$(dirname "$0")"
+
+# Use the project's uv-managed Python 3.12 virtual environment
+export UV_PYTHON_PREFERENCE="only-managed"
+exec uv run python UmbraEdit.py "$@"

umbraedit/__init__.py

@@ -51,8 +51,8 @@ __author__     = "Veronica Berglyd Olsen"
 __maintainer__ = "Veronica Berglyd Olsen"
 __email__      = "code@vkbo.net"
 __version__    = "1.0.0"
-__hexversion__ = "0x260300b1"
-__date__       = "2026-10-20"
+__hexversion__ = "0x01000000"
+__date__       = "2026-11-05"
 __status__     = "Stable"
 __domain__     = "umbraedit.io"
 # fmt: on

umbraedit/guimain.py

@@ -110,7 +110,9 @@ class GuiMain(QMainWindow):
         self._setWindowSize(CONFIG.mainWinSize)
         self._updateWindowTitle()
 
-        nwIcon = CONFIG.assetPath("icons") / "umbraedit.svg"
+        nwIcon = CONFIG.assetPath("icons") / "umbraedit.png"
+        if not safeIsFile(nwIcon):
+            nwIcon = CONFIG.assetPath("icons") / "umbraedit.svg"
         self.nwIcon = QIcon(str(nwIcon)) if safeIsFile(nwIcon) else QIcon()
         self.setWindowIcon(self.nwIcon)
         QApplication.setWindowIcon(self.nwIcon)