Fix bun.lock, status icon overrides, and Pi custom-endpoint routing

[ImLukeF]

Summary

• refresh bun.lock so bun install --frozen-lockfile passes again on main
• resolve status icon config values like in-progress.svg from statuses/icons/ and cover the override logic with tests
• preserve Pi provider routing when switching to custom endpoints, including manual URL edits, and add helper-level tests

Fixes #358
Fixes #359
Fixes #363

Verification

• bun test apps/electron/src/renderer/components/apisetup/tests/ApiKeyInput.test.ts apps/electron/src/renderer/components/ui/tests/status-icon.test.ts apps/electron/src/renderer/hooks/tests/useOnboarding.test.ts apps/electron/src/main/tests/connection-setup-logic.test.ts
• bun run typecheck:electron
• bun install --frozen-lockfile