Cline rules

1---
2description: Core project identity and non-negotiable rules for the account-switcher browser extension
3alwaysApply: true
4---
5 
6This repository is a browser extension for switching accounts across Chrome and Firefox.
7 
8Core expectations:
9- Work only in source files under `src/` unless the task explicitly requires build/config updates.
10- Never modify generated output under `dist/`.
11- Preserve cross-browser compatibility between Chrome and Firefox.
12- Follow the existing build and packaging approach already used in this repository.
13- Keep changes small, reviewable, and consistent with the existing architecture.
14 
15Technology expectations:
16- Use TypeScript with strict typing.
17- Avoid unchecked `any`; prefer precise types, unions, guards, and shared interfaces.
18- Reuse the existing module aliases: `@background/*`, `@popup/*`, `@shared/*`.
19 
20Change discipline:
21- Prefer incremental edits over broad rewrites.
22- If a task likely changes more than 3 files, propose a short plan first.
23- Match existing naming, file organization, and message/storage conventions before introducing new abstractions.
24- When changing behavior, explain the impact briefly and list the files affected.