feat: enhance chunking mode documentation and configuration

- Added `chunkMode` option to the BlueBubbles account configuration, allowing users to choose between "length" and "newline" for message chunking.
- Updated documentation to clarify the behavior of the `chunkMode` setting.
- Adjusted account merging logic to incorporate the new `chunkMode` configuration.

docs/channels/bluebubbles.md

@@ -196,6 +196,7 @@ Provider options:
 - `channels.bluebubbles.sendReadReceipts`: Send read receipts (default: `true`).
 - `channels.bluebubbles.blockStreaming`: Enable block streaming (default: `true`).
 - `channels.bluebubbles.textChunkLimit`: Outbound chunk size in chars (default: 4000).
+- `channels.bluebubbles.chunkMode`: `newline` (default) splits on every newline and sends each line immediately during streaming; `length` splits only when exceeding `textChunkLimit`.
 - `channels.bluebubbles.mediaMaxMb`: Inbound media cap in MB (default: 8).
 - `channels.bluebubbles.historyLimit`: Max group messages for context (0 disables).
 - `channels.bluebubbles.dmHistoryLimit`: DM history limit.

extensions/bluebubbles/src/accounts.ts

@@ -47,7 +47,8 @@ function mergeBlueBubblesAccountConfig(
   };
   const { accounts: _ignored, ...rest } = base;
   const account = resolveAccountConfig(cfg, accountId) ?? {};
-  return { ...rest, ...account };
+  const chunkMode = account.chunkMode ?? rest.chunkMode ?? "newline";
+  return { ...rest, ...account, chunkMode };
 }
 
 export function resolveBlueBubblesAccount(params: {

extensions/bluebubbles/src/types.ts

@@ -38,7 +38,7 @@ export type BlueBubblesAccountConfig = {
   dms?: Record<string, unknown>;
   /** Outbound text chunk size (chars). Default: 4000. */
   textChunkLimit?: number;
-  /** Chunking mode: "length" (default) splits by size, "newline" splits on every newline. */
+  /** Chunking mode: "newline" (default) splits on every newline; "length" splits by size. */
   chunkMode?: "length" | "newline";
   blockStreaming?: boolean;
   /** Merge streamed block replies before sending. */