feat: slightly increase saturation of colors

It really depends on the screen,
but on Android phones with higher DPI
than laptop screen the contrast
looks a bit too low.

It should not be increased too high
because of clipping.

src/chat/chat_tests.rs

@@ -34,7 +34,7 @@ async fn test_chat_info() {
   "archived": false,
   "param": "",
   "is_sending_locations": false,
-  "color": 29377,
+  "color": 29381,
   "profile_image": {},
   "draft": "",
   "is_muted": false,
@@ -1933,7 +1933,7 @@ async fn test_chat_get_color() -> Result<()> {
     let t = TestContext::new().await;
     let chat_id = create_group_ex(&t, None, "a chat").await?;
     let color1 = Chat::load_from_db(&t, chat_id).await?.get_color(&t).await?;
-    assert_eq!(color1, 0x613dd7);
+    assert_eq!(color1, 0x6239dc);
 
     // upper-/lowercase makes a difference for the colors, these are different groups
     // (in contrast to email addresses, where upper-/lowercase is ignored in practise)

src/color.rs

@@ -28,7 +28,7 @@ fn rgb_to_u32(rgb: Rgb<u8>) -> u32 {
 /// Lightness is set to half (0.5) to make colors suitable both for light and dark theme.
 pub fn str_to_color(s: &str) -> u32 {
     let lightness = 0.5;
-    let chroma = 0.22;
+    let chroma = 0.23;
     let angle = str_to_angle(s);
     let oklch = Oklch::new(lightness, chroma, angle);
     let rgb = oklch.to_rgb(TransferFunction::Srgb);

src/contact/contact_tests.rs

@@ -759,7 +759,7 @@ async fn test_contact_get_color() -> Result<()> {
     let t = TestContext::new().await;
     let contact_id = Contact::create(&t, "name", "name@example.net").await?;
     let color1 = Contact::get_by_id(&t, contact_id).await?.get_color();
-    assert_eq!(color1, 0x4947dc);
+    assert_eq!(color1, 0x4844e2);
 
     let t = TestContext::new().await;
     let contact_id = Contact::create(&t, "prename name", "name@example.net").await?;