rebrand: rename VoiceBox to TalkBox throughout codebase

- All 'voicebox'/'Voicebox'/'VOICEBOX' strings replaced with 'talkbox'/'TalkBox'/'TALKBOX'
- Port changed from 17493 to 17494 (avoids conflict with upstream VoiceBox)
- MCP tool namespace: voicebox.* -> talkbox.*
- App bundle ID: sh.voicebox.app -> com.talkbox.app
- Binary names: voicebox-server -> talkbox-server, voicebox-mcp -> talkbox-mcp
- Docker user/group: voicebox -> talkbox
- Database: voicebox.db -> talkbox.db
- Env vars: VOICEBOX_* -> TALKBOX_*
- Asset files renamed: voicebox-logo.* -> talkbox-logo.*, etc.
- External binaries in tauri.conf.json updated to talkbox-server/talkbox-mcp

backend/utils/chunked_tts.py

@@ -15,7 +15,7 @@ from typing import List, Tuple
 
 import numpy as np
 
-logger = logging.getLogger("voicebox.chunked-tts")
+logger = logging.getLogger("talkbox.chunked-tts")
 
 # Default chunk size in characters.  Can be overridden per-request via
 # the ``max_chunk_chars`` field on GenerationRequest.

backend/utils/hf_offline_patch.py

@@ -154,7 +154,7 @@ def patch_transformers_mistral_regex():
     variant. That call raises on ``HF_HUB_OFFLINE=1`` and on plain network
     failures, killing unrelated loads (Qwen TTS, TADA, etc.).
 
-    Voicebox never loads Mistral models, so the rewrite the function would
+    TalkBox never loads Mistral models, so the rewrite the function would
     apply is a no-op for us anyway. Wrap the method so any exception from the
     metadata lookup returns the tokenizer unchanged — matching the success-path
     behavior for non-Mistral repos (transformers 4.57.3,
@@ -264,7 +264,7 @@ def ensure_original_qwen_config_cached():
             logger.warning("could not create cache symlink for %s", original_repo, exc_info=True)
 
 
-if os.environ.get("VOICEBOX_OFFLINE_PATCH", "1") != "0":
+if os.environ.get("TALKBOX_OFFLINE_PATCH", "1") != "0":
     patch_huggingface_hub_offline()
     patch_transformers_mistral_regex()
     ensure_original_qwen_config_cached()