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

scripts/setup-dev-sidecar.js

@@ -47,7 +47,7 @@ function getTargetTriple() {
 
 // Create a minimal executable for the platform. ``baseName`` is the
 // sidecar identifier as declared in tauri.conf.json's ``externalBin``
-// (e.g. "voicebox-server", "voicebox-mcp"). Tauri appends the target
+// (e.g. "talkbox-server", "talkbox-mcp"). Tauri appends the target
 // triple to that name at compile time.
 function createPlaceholderBinary(targetTriple, baseName) {
   const isWindows = targetTriple.includes('windows');
@@ -369,7 +369,7 @@ exit 1
 // Every sidecar listed in tauri.conf.json's ``externalBin`` needs a
 // file on disk at compile time, even in dev. Add to this list whenever
 // a new sidecar is introduced.
-const SIDECAR_BASE_NAMES = ['voicebox-server', 'voicebox-mcp'];
+const SIDECAR_BASE_NAMES = ['talkbox-server', 'talkbox-mcp'];
 
 function main() {
   const targetTriple = getTargetTriple();