fix(icons): improve Linux tray display and refresh assets (#362)

Returning an empty `icon_name` in `tray_linux_ksni.rs` forces SNI
panels (e.g., KDE Plasma) to render the explicit `IconPixmap` data.
This prevents panels from incorrectly resolving the full-color app icon
from the system theme instead of the intended monochrome tray glyph.

Also updates `src-tauri/icons/icon-symbolic.svg` and regenerates
all `tray-dark-*.png` and `tray-light-*.png` assets.
Adds `static/logo.svg` as the main application logo.

src-tauri/icons/icon-symbolic.svg

@@ -1,16 +1,32 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <svg xmlns="http://www.w3.org/2000/svg"
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-    <g transform="matrix(0.1,0,0,-0.1,0,1198)">
-      <path stroke-width="320"
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-            stroke-linecap="round"
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+     viewBox="0 0 1024 1024"
+     width="1024"
+     height="1024">
+  <g transform="translate(0,1024) scale(0.1,-0.1)" fill="currentColor">
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 </svg>

src-tauri/src/tray_linux_ksni.rs

@@ -147,9 +147,12 @@ impl Tray for QbzTray {
     }
 
     fn icon_name(&self) -> String {
-        // Fall back to the themed icon name when the panel prefers it over
-        // pixmap data (some GNOME extensions, certain remote X11 setups).
-        "com.blitzfc.qbz".into()
+        // Intentionally empty: SNI panels (KDE Plasma especially) prefer
+        // IconName over IconPixmap when both are present, and resolving the
+        // app id `com.blitzfc.qbz` against the icon theme picks up the full
+        // colour app icon instead of our themed monochrome glyph (issue #362).
+        // An empty name forces panels to render IconPixmap directly.
+        String::new()
     }
 
     fn icon_pixmap(&self) -> Vec<Icon> {