Give local Tauri app a distinct ocd dev identity

[oxfern]

Summary

Give the local macOS Tauri app a distinct ocd identity and lavender icon so it can run beside a packaged CovenCave instance.

Why

Raw tauri dev launches a generic Cargo binary without a stable macOS bundle identity, causing confusing Dock, window, process, and data-container overlap during local development.

Changes

• Apply the dev-only name ocd, bundle identifier ai.opencoven.cave.dev, and dedicated icon assets
• Launch the Cargo debug executable through a lightweight macOS .app wrapper
• Generate deterministic padded-superellipse icon variants from the canonical source
• Derive native main, Quick Chat, and Notch titles from the active Tauri product configuration
• Pin production branding and dev identity behavior in the launcher test

Verification

• pnpm dev:icons
• node scripts/dev-app.test.mjs
• node scripts/dev-app-origin-health.test.mjs
• node scripts/dev-app-teardown.test.mjs
• pnpm typecheck
• pnpm lint
• pnpm check:tests-wired
• cargo check --manifest-path src-tauri/Cargo.toml
• Live macOS launch confirmed LSDisplayName=ocd, CFBundleIdentifier=ai.opencoven.cave.dev, and clean teardown

Risk + rollout notes

The runner and identity override are development-only; packaged production configuration remains CovenCave / ai.opencoven.cave and requires no migration.