Add eslint v9 + @typescript-eslint/parser + eslint-plugin-obsidianmd as
a dedicated `npm run lint:obsidian` track, separate from the existing
biome lint. Apply autofixes from the recommended config and resolve the
follow-on type/test issues.
- prefer-create-el: createEl('div'/'span') -> createDiv/createSpan
- prefer-active-window-timers: setTimeout/clearTimeout -> activeWindow.*
+ retype timer holders from ReturnType<typeof setTimeout> to number
- prefer-active-doc: drop globalThis.fetch in streaming
- no-useless-catch: drop no-op rethrow wrapper
- no-restricted-globals: streaming.ts is exempted because requestUrl
does not support streaming responses
- @typescript-eslint/no-unsafe-*: disabled (out of scope for an Obsidian
plugin lint pass; tsc + biome already cover type safety)
- tests: polyfill globalThis.activeWindow so unit tests still run in Node
Change-Id: I43cc652e29a66d490e2834e940843c39b211b80b
