feat: agent builder, CWD support, auto-save, UI polish, unavailable tool handling

- Agent Builder: full CRUD with card grid, drag-and-drop model reorder, edit/delete
- Auto-save on edit with 600ms debounce, AbortController for concurrency, fieldset disabled until name entered
- Agent definitions stored as TOML with cwd field, loaded from global/project dirs
- Working directory: per-tab CWD override in Chat Settings, agent default CWD, auto-create on first message
- CWD validation: check-dir endpoint with ~ expansion, real-time validity indicator
- Subagent CWD validated against parent's effective CWD using path.relative
- Unavailable tool calls: caught gracefully, shown as tool call with error badge, model retries
- UI: tab bar border radius, sidebar border removed, chat input ghost style, scroll-to-bottom rectangle
- Skills dir collapse uses CSS rotation, Model Choice renamed to Chat Settings, System Prompt view removed
- Reusable SkillsBrowser/ToolPermissions with external mode for Agent Builder
- ModelSelector: Agent/Manual toggle, agent list, Agent Settings link
- Page router, skills recursive scanning, bin/up gopass removed, docker volume mounts

1 files changed, 3 insertions, 1 deletions

diff --git a/packages/core/src/config/loader.ts b/packages/core/src/config/loader.ts
index 3b4d733..bccbb8f 100644
--- a/packages/core/src/config/loader.ts
+++ b/packages/core/src/config/loader.ts
@@ -28,7 +28,9 @@ export function loadConfig(dir: string): DispatchConfig {
 			// File doesn't exist — return empty default
 			return DEFAULT_CONFIG;
 		}
-		console.warn(`dispatch: failed to parse dispatch.toml: ${err instanceof Error ? err.message : String(err)}`);
+		console.warn(
+			`dispatch: failed to parse dispatch.toml: ${err instanceof Error ? err.message : String(err)}`,
+		);
 		throw err;
 	}