Fix missing hashCode implementations for SpotBugs compliance (#4316)

* Fix SpotBugs warnings for missing or inconsistent hashCode

Implemented proper hashCode() methods in classes overriding equals():
- Geofence: Uses ID, radius, expiration, and location coordinates.
- PropertyBase: Uses name.
- Font: Uses font properties (face, size, style) or native font hash.
- Border: Uses type, color, thickness, arc, etc.
- Style: Uses visual properties (colors, font, background).
- TarEntry: Added equals(Object) and hashCode based on header name.
- CustomFont: Uses charset and cutOffsets.
- Transform: Uses type and transformation matrix values.
- CSSBorder (and inner classes): Uses identity hash or field hashes.
- RoundBorder/RoundRectBorder: Uses identity hash (consistent with equals).
- ImageDownloadService: Uses cacheId.
- Layouts (Border, Box, Flow, Grid, Table): Use layout properties.

* Fix SpotBugs warnings: Implement proper hashCode and equals for core classes

- Implemented consistent `hashCode()` and `equals()` for:
  - `Geofence`: uses id, location, radius, expiration.
  - `PropertyBase`: uses name.
  - `Font`: uses native font or attributes.
  - `Border` / `CSSBorder` / `RoundBorder`: uses fields or identity where appropriate.
  - `Style`: manual hash calculation for primitive arrays (margin/padding) to avoid missing Arrays utility in CLDC.
  - `TarEntry`: added `equals(Object)` override and `hashCode` based on header name.
  - `Transform`: uses type and matrix values.
  - `ImageDownloadService`: uses cacheId.
  - `BoxLayout`: added `align` to equals/hashCode to fix layout update issues.
  - `BorderLayout`, `FlowLayout`, `GridLayout`, `TableLayout`: uses configuration fields.
- Fixed `BoxLayout` equality check to include alignment, resolving layout update regression.
- Manual array hashing in `Style` ensures CLDC 1.1 compatibility.

* Fix SpotBugs hashCode warnings while preserving legacy behavior

- Reverted `Style.hashCode` to use `System.identityHashCode(this)` to prevent regressions in layout and caching caused by value-based hashing of mutable UI state.
- Reverted `BoxLayout` equality to ignore `align` (matching previous behavior) to resolve test failures.
- Implemented consistent `hashCode()` for:
  - `Geofence`: uses id, location, radius, expiration.
  - `PropertyBase`: uses name.
  - `Font`: uses native font or attributes.
  - `Border` / `CSSBorder` / `RoundBorder`: uses fields or identity where appropriate.
  - `TarEntry`: added `equals(Object)` override and `hashCode`.
  - `Transform`: uses type and matrix values.
  - `ImageDownloadService`: uses cacheId.
  - `BorderLayout`, `FlowLayout`, `GridLayout`, `TableLayout`: uses configuration fields.

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: google-labs-jules[bot]

CodenameOne/src/com/codename1/io/services/ImageDownloadService.java

@@ -934,6 +934,13 @@ public boolean equals(Object o) {
                 ((ImageDownloadService) o).cacheId.equals(cacheId);
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public int hashCode() {
+        return cacheId != null ? cacheId.hashCode() : 0;
+    }
+
     /**
      * @return the maintainAspectRatio
      */