fix(telegram): warn when accounts.default is missing in multi-account setup (#32544)

Merged via squash.

Prepared head SHA: 7ebc3f65b2
Co-authored-by: Sid-Qin <201593046+Sid-Qin@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras

src/routing/default-account-warnings.ts

@@ -0,0 +1,17 @@
+export function formatChannelDefaultAccountPath(channelKey: string): string {
+  return `channels.${channelKey}.defaultAccount`;
+}
+
+export function formatChannelAccountsDefaultPath(channelKey: string): string {
+  return `channels.${channelKey}.accounts.default`;
+}
+
+export function formatSetExplicitDefaultInstruction(channelKey: string): string {
+  return `Set ${formatChannelDefaultAccountPath(channelKey)} or add ${formatChannelAccountsDefaultPath(channelKey)}`;
+}
+
+export function formatSetExplicitDefaultToConfiguredInstruction(params: {
+  channelKey: string;
+}): string {
+  return `Set ${formatChannelDefaultAccountPath(params.channelKey)} to one of these accounts, or add ${formatChannelAccountsDefaultPath(params.channelKey)}`;
+}