Fixes the wails3 dev boot failure and removes remaining v2-isms so the tree matches a stock v3 project.
- frontend/package.json: add missing build:dev script (vite build --minify false --mode development). The dev taskflow runs npm run build:dev, which v2-era package.json never had - this was the wails3 dev boot failure.
- frontend/vite.config.ts: add the @wailsio/runtime vite plugin (typed custom events, as in every v3 template) and the server host/port/strictPort block (5173, matching the dev task).
- Remove stale v2 build dirs build/darwin + build/windows (v2 wails scaffolding; v3 generates its own via build-assets if ever needed).
- Delete untracked frontend/package.json.md5 (v2 change-detection artifact; v3 Taskfile uses content-hash sources) and drop its gitignore rule.
- go.mod: delete the leftover commented-out v2 replace directive.
- README.md: dev/build docs updated to make dev / make build (wails3), dropping the v2 :34115 browser-server paragraph; install link points at v3 docs.
Verified: production vite build green with the plugin, and wails3 dev boots end-to-end (bindings regen, build:dev, vite on :5173, asset server connected, AniTrack 1.6.8 window mapped).
Regenerated bindings with wails3 generate bindings (1 service, 29 methods, 25 models) into frontend/bindings/AniTrack as TypeScript; output verified byte-deterministic across regens, so it is committed like wailsjs was.
- 10 Svelte files: wailsjs/go/main/App imports -> import {App} from bindings/AniTrack with App.* call prefixes. No logic or markup changes.
- WebsiteLink.svelte: BrowserOpenURL -> Browser.OpenURL from @wailsio/runtime.
- AvatarMenu.svelte: runtime.Quit -> Application.Quit from @wailsio/runtime.
- package.json: add @wailsio/runtime pinned to 3.0.0-beta.20 (exact, matching the Go framework); lockfile updated, all deps still max in-range, majors deferred.
- Production vite build passes with the new bindings.