Add Liberapay alongside Ko-fi for donations (#430)

Adds Liberapay as a second donation option next to Ko-fi.

- Settings: "Support development" now opens a full-screen picker with Ko-fi (one-off tips) and Liberapay (recurring donations) instead of linking straight to Ko-fi.
- README: Liberapay badge next to the Ko-fi badge, plus a short Support section.

No issue for this one.

Co-authored-by: Jean-Luc Makiola <business@jeanlucmakiola.de>
Reviewed-on: https://codeberg.org/jlmakiola/calendula/pulls/430

README.md

@@ -23,6 +23,8 @@ It works on top of the system calendar and has no network access.</p>
 <a href="https://apps.obtainium.imranr.dev/redirect?r=obtainium://add/https://codeberg.org/jlmakiola/calendula"><img src="https://github.com/ImranR98/Obtainium/blob/main/assets/graphics/badge_obtainium.png?raw=true" alt="Get it on Obtainium" height="56"></a>
 &nbsp;
 <a href="https://ko-fi.com/jeanlucmakiola"><img src="https://storage.ko-fi.com/cdn/brandasset/v2/support_me_on_kofi_badge_beige.png" alt="Support me on Ko-fi" height="56"></a>
+&nbsp;
+<a href="https://liberapay.com/Jean-Luc_Makiola/donate"><img src="https://liberapay.com/assets/widgets/donate.svg" alt="Donate using Liberapay" height="56"></a>
 </p>
 
 <p>
@@ -203,6 +205,13 @@ anywhere. Your events stay in Android's own calendar store.
 [Privacy policy](https://jeanlucmakiola.de/calendula/privacy), written in
 [`docs/PRIVACY.md`](docs/PRIVACY.md), which is what that page renders.
 
+## Support
+
+Calendula is free and has no ads. If you'd like to support its development,
+you can tip once on [Ko-fi](https://ko-fi.com/jeanlucmakiola) or donate
+regularly on [Liberapay](https://liberapay.com/Jean-Luc_Makiola/donate). Both
+are linked in the app under *Settings → Support development*.
+
 ## License
 
 [MIT](LICENSE), Jean-Luc Makiola, 2026

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsScreen.kt

@@ -15,6 +15,7 @@ import androidx.compose.foundation.layout.requiredSize
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Autorenew
 import androidx.compose.material.icons.filled.Backup
 import androidx.compose.material.icons.filled.BugReport
 import androidx.compose.material.icons.filled.Cake
@@ -23,6 +24,7 @@ import androidx.compose.material.icons.filled.Code
 import androidx.compose.material.icons.filled.Favorite
 import androidx.compose.material.icons.filled.Gavel
 import androidx.compose.material.icons.filled.Language
+import androidx.compose.material.icons.filled.LocalCafe
 import androidx.compose.material.icons.filled.Notifications
 import androidx.compose.material.icons.filled.Palette
 import androidx.compose.material.icons.filled.PrivacyTip
@@ -56,6 +58,7 @@ import de.jeanlucmakiola.calendula.ui.common.rememberCalendarSlideSpec
 import de.jeanlucmakiola.calendula.ui.licences.LicencesScreen
 import de.jeanlucmakiola.floret.components.AboutCard
 import de.jeanlucmakiola.floret.components.CollapsingScaffold
+import de.jeanlucmakiola.floret.components.FullScreenPicker
 import de.jeanlucmakiola.floret.components.GroupedListInset
 import de.jeanlucmakiola.floret.components.GroupedRow
 import de.jeanlucmakiola.floret.components.OptionPicker
@@ -392,17 +395,46 @@ private fun AboutCard() {
     )
 }
 
-/** "Support development", as the closing row of the About card's group. */
+/**
+ * "Support development", as the closing row of the About card's group. Opens a
+ * picker of the donation platforms.
+ */
 @Composable
 private fun SupportRow() {
     val context = LocalContext.current
-    val url = stringResource(R.string.about_support_url)
+    var showPicker by rememberSaveable { mutableStateOf(false) }
+
     GroupedRow(
         title = stringResource(R.string.settings_about_support),
         position = Position.Bottom,
         leading = { CategoryIcon(Icons.Default.Favorite, ChipAccent.Primary) },
-        onClick = { openUrl(context, url) },
+        onClick = { showPicker = true },
     )
+
+    if (showPicker) {
+        val kofiUrl = stringResource(R.string.about_support_kofi_url)
+        val liberapayUrl = stringResource(R.string.about_support_liberapay_url)
+        FullScreenPicker(
+            title = stringResource(R.string.settings_about_support),
+            onDismiss = { showPicker = false },
+            predictiveBack = true,
+        ) {
+            GroupedRow(
+                title = stringResource(R.string.settings_support_kofi),
+                summary = stringResource(R.string.settings_support_kofi_hint),
+                position = Position.Top,
+                leading = { CategoryIcon(Icons.Default.LocalCafe, ChipAccent.Primary) },
+                onClick = { openUrl(context, kofiUrl) },
+            )
+            GroupedRow(
+                title = stringResource(R.string.settings_support_liberapay),
+                summary = stringResource(R.string.settings_support_liberapay_hint),
+                position = Position.Bottom,
+                leading = { CategoryIcon(Icons.Default.Autorenew, ChipAccent.Primary) },
+                onClick = { openUrl(context, liberapayUrl) },
+            )
+        }
+    }
 }
 
 /**

app/src/main/res/values/strings.xml

@@ -681,6 +681,10 @@
     <string name="settings_licences_subtitle">The projects Calendula is built on</string>
     <string name="settings_about_privacy">Privacy policy</string>
     <string name="settings_about_support">Support development</string>
+    <string name="settings_support_kofi">Ko-fi</string>
+    <string name="settings_support_kofi_hint">One-off tips</string>
+    <string name="settings_support_liberapay">Liberapay</string>
+    <string name="settings_support_liberapay_hint">Recurring donations</string>
     <string name="settings_about_version">Version %1$s</string>
     <string name="settings_about_logo_desc">Calendula app icon</string>
     <string name="settings_report_problem">Report a problem</string>
@@ -834,7 +838,8 @@
     <string name="about_source_url" translatable="false">https://codeberg.org/jlmakiola/calendula</string>
     <string name="about_license_url" translatable="false">https://codeberg.org/jlmakiola/calendula/src/branch/main/LICENSE</string>
     <string name="about_privacy_url" translatable="false">https://jeanlucmakiola.de/calendula/privacy</string>
-    <string name="about_support_url" translatable="false">https://ko-fi.com/jeanlucmakiola</string>
+    <string name="about_support_kofi_url" translatable="false">https://ko-fi.com/jeanlucmakiola</string>
+    <string name="about_support_liberapay_url" translatable="false">https://liberapay.com/Jean-Luc_Makiola/donate</string>
     <string name="about_translate_url" translatable="false">https://weblate.dev.jeanlucmakiola.de/engage/calendula/</string>
 
     <!-- Crash reporting: a captured report the user can submit, by hand, as a