Fix FONT_PITCH_AND_FAMILY, CreateBitmap, and linuxdeploy ELF wrapper

Windows (windows-rs 0.61):
- FONT_PITCH_AND_FAMILY does not exist; ipitchandfamily is u32 - revert
  to (DEFAULT_PITCH.0 | FF_DONTCARE.0) as u32
- CreateBitmap returns HBITMAP directly (not Result<HBITMAP>); replace
  .map_err()? with explicit null pointer check on hbm_mask.0

Linux AppImage:
- Shell script wrapper is destroyed by Tauri's `dd if=/dev/zero bs=1
  count=3 seek=8` which zeroes the shebang at bytes 8-10
- Compile a tiny C ELF forwarder instead: ELF bytes 8-10 are
  EI_OSABI/EI_ABIVERSION padding (already zero), dd is a no-op
- Use page-aligned squashfs offset search for more reliable extraction
- Add set -e to Stage step and explicit gcc install

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -127,7 +127,7 @@ jobs:
         run: |
           apt-get update
           apt-get install -y \
-            curl wget file \
+            curl wget file gcc \
             libwebkit2gtk-4.1-dev \
             libssl-dev \
             libxdo-dev \
@@ -154,21 +154,38 @@ jobs:
 
       - name: Stage AppRun and linuxdeploy for AppImage bundler
         run: |
+          set -e
           mkdir -p ~/.cache/tauri
           cp tools/AppRun-x86_64 ~/.cache/tauri/AppRun-x86_64
           chmod +x ~/.cache/tauri/AppRun-x86_64
-          # Pre-extract linuxdeploy AppImage so it runs without FUSE in Docker
+
+          # Download and extract linuxdeploy without FUSE.
+          # Tauri also runs `dd if=/dev/zero bs=1 count=3 seek=8` on the cached file
+          # to hide AppImage magic bytes — this corrupts a shell script's shebang.
+          # A compiled ELF binary is safe: bytes 8-10 (EI_OSABI/EI_ABIVERSION/pad)
+          # are already zero in standard ELF and survive the dd no-op.
           wget -q \
             "https://github.com/tauri-apps/binary-releases/releases/download/linuxdeploy/linuxdeploy-x86_64.AppImage" \
             -O /tmp/linuxdeploy.AppImage
+
+          # Find squashfs at a page-aligned boundary after the ELF runtime
           OFFSET=$(python3 -c "
 d=open('/tmp/linuxdeploy.AppImage','rb').read()
-o=d.find(b'hsqs')
+for i in range(4096,len(d),4096):
-print(o if o!=-1 else d.find(b'sqsh'))
+    if d[i:i+4] in (b'hsqs',b'sqsh'):
+        print(i); break
 ")
           unsquashfs -d /tmp/linuxdeploy-root -offset "$OFFSET" /tmp/linuxdeploy.AppImage
-          printf '#!/bin/sh\nexec /tmp/linuxdeploy-root/AppRun "$@"\n' \
+
-            > ~/.cache/tauri/linuxdeploy-x86_64.AppImage
+          # Compile a tiny ELF forwarder as the cached AppImage entry point
+          cat > /tmp/ld_wrapper.c << 'CSRC'
+#include <unistd.h>
+int main(int argc, char** argv) {
+    execv("/tmp/linuxdeploy-root/AppRun", argv);
+    return 1;
+}
+CSRC
+          gcc -o ~/.cache/tauri/linuxdeploy-x86_64.AppImage /tmp/ld_wrapper.c
           chmod +x ~/.cache/tauri/linuxdeploy-x86_64.AppImage
 
       - name: Build

src-tauri/src/lib.rs

@@ -106,7 +106,7 @@ fn set_badge_count(count: u32, window: tauri::Window) -> Result<(), String> {
                     ReleaseDC, SelectObject, SetBkMode, SetTextColor, BITMAPINFO,
                     BITMAPINFOHEADER, BI_RGB, CLIP_DEFAULT_PRECIS, DEFAULT_CHARSET, DEFAULT_PITCH,
                     DEFAULT_QUALITY, DT_CENTER, DT_SINGLELINE, DT_VCENTER, FF_DONTCARE,
-                    FONT_PITCH_AND_FAMILY, FW_BOLD, OUT_DEFAULT_PRECIS, PS_NULL, TRANSPARENT,
+                    FW_BOLD, OUT_DEFAULT_PRECIS, PS_NULL, TRANSPARENT,
                 },
                 UI::{
                     Shell::{ITaskbarList3, TaskbarList},
@@ -168,7 +168,7 @@ fn set_badge_count(count: u32, window: tauri::Window) -> Result<(), String> {
                     OUT_DEFAULT_PRECIS,
                     CLIP_DEFAULT_PRECIS,
                     DEFAULT_QUALITY,
-                    FONT_PITCH_AND_FAMILY(DEFAULT_PITCH.0 | FF_DONTCARE.0),
+                    (DEFAULT_PITCH.0 | FF_DONTCARE.0) as u32,
                     windows::core::w!("Segoe UI"),
                 );
                 let old_font = SelectObject(hdc, hfont.into());
@@ -191,8 +191,11 @@ fn set_badge_count(count: u32, window: tauri::Window) -> Result<(), String> {
                 let _ = DeleteObject(hpen.into());
                 let _ = DeleteObject(hfont.into());
 
-                let hbm_mask = CreateBitmap(size, size, 1, 1, None)
+                let hbm_mask = CreateBitmap(size, size, 1, 1, None);
-                    .map_err(|e| { let _ = DeleteObject(hbm_color.into()); e.to_string() })?;
+                if hbm_mask.0 as usize == 0 {
+                    let _ = DeleteObject(hbm_color.into());
+                    return Err("CreateBitmap failed".to_string());
+                }
 
                 let icon_info = ICONINFO {
                     fIcon: BOOL(1),