docs: drop the Cash App comparison; remove avatar mentions from the README

Rephrase the README as 'pay-by-username' and scrub the Cash App name from
code comments. Also drop the leftover 'hosted avatar'/'avatars' wording —
identities use generated identicons, not uploaded pictures.

README.md

@@ -4,7 +4,7 @@
 
 # Goblin
 
-Goblin is a private, Cash App-style wallet for [GRIN ツ](https://grin.mw) — confidential digital cash on [Mimblewimble](https://github.com/mimblewimble/grin), with no amounts or addresses on the chain.
+Goblin is a private, pay-by-username wallet for [GRIN ツ](https://grin.mw) — confidential digital cash on [Mimblewimble](https://github.com/mimblewimble/grin), with no amounts or addresses on the chain.
 
 Instead of passing slatepack files back and forth, you **pay a `username` (or an `npub`)** and the payment is delivered for you as an **end-to-end encrypted message over [nostr](https://github.com/nostr-protocol/nips), routed through the [Nym mixnet](https://nym.com)**. Relays only ever see ciphertext — never the amount, the sender, or the recipient — and the mixnet hides who is talking to whom at the network layer.
 
@@ -14,8 +14,8 @@ Goblin is a fork of the **Grim** egui GRIN wallet: it keeps Grim's full GRIN nod
 
 - **Send to people** — pay a `username` or `npub`; the GRIN slatepack travels as a [NIP-17](https://nips.nostr.com/17) gift-wrapped DM ([kind 1059](https://nostrbook.dev/kinds/1059)) over the Nym mixnet and is applied automatically by the recipient's wallet. No files to swap, no need to both be online at once.
 - **Manual slatepacks too** — when you need to pay or get paid without a handle, **Settings → Wallet → Slatepacks** exposes the classic by-hand flow: create a slatepack to send, or paste one to receive, finalize, or pay.
-- **In-app identity** — a nostr payment key that is deliberately *not* part of your seed, so you can rotate it any time to stay unlinkable without touching your funds. An optional human-readable `name` (and hosted avatar) comes from the goblin.st identity service.
-- **Private by construction** — GRIN's address-less, confidential chain; your payments and identity (nostr relays, NIP-05 lookups, price, avatars) are routed through the [Nym mixnet](https://nym.com), so who-pays-whom never touches the clear net. The GRIN node connection — block sync and broadcasting your transaction — is direct: public chain data, the same for everyone, and not tied to your identity. Keys, names and history stay on your device.
+- **In-app identity** — a nostr payment key that is deliberately *not* part of your seed, so you can rotate it any time to stay unlinkable without touching your funds. An optional human-readable `name` comes from the goblin.st identity service.
+- **Private by construction** — GRIN's address-less, confidential chain; your payments and identity (nostr relays, NIP-05 lookups, price) are routed through the [Nym mixnet](https://nym.com), so who-pays-whom never touches the clear net. The GRIN node connection — block sync and broadcasting your transaction — is direct: public chain data, the same for everyone, and not tied to your identity. Keys, names and history stay on your device.
 - **Configurable amount pairing** — show balances against a world currency, Bitcoin, or sats (rates fetched over the mixnet), or turn the preview off.
 - **Cross-platform** — Linux, macOS, Windows, Android, built in pure Rust on [egui](https://github.com/emilk/egui).
 

src/gui/theme.rs

@@ -194,7 +194,7 @@ thread_local! {
 /// RAII guard that forces [`kind`]/[`tokens`] to a specific theme for its
 /// lifetime, restoring the previous value on drop (panic-safe). Used to paint
 /// one surface — the Pay tab — in the yellow theme regardless of the user's
-/// chosen theme, à la Cash App's brand-colored pay screen.
+/// chosen theme, à la a modern pay app's brand-colored pay screen.
 #[must_use = "the override only lasts while the guard is alive"]
 pub struct ScopedTheme(Option<ThemeKind>);
 

src/gui/views/goblin/mod.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! The Goblin Cash App-style wallet surface for an open wallet.
+//! The Goblin payment-app-style wallet surface for an open wallet.
 
 pub mod avatars;
 pub mod data;
@@ -548,7 +548,7 @@ impl GoblinWalletView {
 					}
 					None => {
 						// Center Pay action: accent ツ puck off the Pay surface; a
-						// chromeless dark ツ on it (Cash App style).
+						// chromeless dark ツ on it (payment-app style).
 						if !pay {
 							let grow = if active || resp.hovered() { 1.0 } else { 0.0 };
 							ui.painter().circle_filled(
@@ -1733,7 +1733,7 @@ impl GoblinWalletView {
 		);
 		ui.add_space(12.0);
 
-		// Recent contacts strip (Cash App-style row above the feed).
+		// Recent contacts strip (payment-app-style row above the feed).
 		self.peers_strip_ui(ui, wallet, "goblin_peers_activity");
 
 		// Pending payment requests pinned on top.

src/gui/views/goblin/widgets.rs

@@ -775,7 +775,7 @@ pub fn numpad(
 	let gap = 14.0;
 	// Center a fixed-width pad so the three columns line up directly under
 	// the centered amount above, on any width. Wider than before to give the
-	// columns more breathing room (Cash App-style).
+	// columns more breathing room (payment-app-style).
 	let pad_w = ui.available_width().min(332.0);
 	let key_w = (pad_w - 2.0 * gap) / 3.0;
 	let side = ((ui.available_width() - pad_w) / 2.0).max(0.0);

src/gui/views/wallets/wallet/content.rs

@@ -50,7 +50,7 @@ pub struct WalletContent {
 	/// Send request creation [`Modal`] content.
 	send_content: Option<SendRequestContent>,
 
-	/// Goblin Cash App-style surface (primary UI).
+	/// Goblin payment-app-style surface (primary UI).
 	goblin: crate::gui::views::goblin::GoblinWalletView,
 }
 
@@ -84,7 +84,7 @@ impl WalletContentContainer for WalletContent {
 
 	fn container_ui(&mut self, ui: &mut egui::Ui, wallet: &Wallet, cb: &dyn PlatformCallbacks) {
 		// Goblin surface is the primary UI. Show a sync screen until data is
-		// ready, then hand the whole surface to the Cash App-style view.
+		// ready, then hand the whole surface to the payment-app-style view.
 		let block_nav_goblin = self.block_navigation_on_sync(wallet);
 		if block_nav_goblin || wallet.get_data().is_none() {
 			egui::CentralPanel::default()

src/nostr/config.rs

@@ -23,7 +23,7 @@ use crate::nostr::relays::{DEFAULT_NIP05_SERVER, DEFAULT_RELAYS};
 /// Policy for accepting incoming payments (Standard1 slates).
 #[derive(Serialize, Deserialize, Clone, Copy, PartialEq, Eq, Debug)]
 pub enum AcceptPolicy {
-	/// Accept payments from anyone automatically (default, Cash App feel).
+	/// Accept payments from anyone automatically (default, instant-pay feel).
 	Everyone,
 	/// Auto-accept contacts, surface unknown senders for approval.
 	Contacts,