chore: clear tech-debt — *.css module decl removes the @ts-ignore; tick F-table

- public/css.d.ts: declare module '*.css' so tsc resolves CSS side-effect
  imports; removed the @ts-ignore in main.ts
- PROGRESS_LOG F1-F9 table ticked to match what's actually verified (F4/F7 still
  need a physical device)

public/css.d.ts

@@ -0,0 +1,4 @@
+// Let tsc resolve CSS side-effect imports (e.g. '@xterm/xterm/css/xterm.css').
+// esbuild does the actual bundling (→ public/build/main.css); this just gives
+// the import a type so we don't need a per-file @ts-ignore.
+declare module '*.css'