Adds a full translation layer (English + European Portuguese) using
BurntSushi/toml with go:embed. Locale detection reads the lang cookie,
falls back to Accept-Language, then defaults to "en". A language switcher
in the nav writes the cookie and redirects back. All 20 personal finance
templates now use {{.T.Get "key"}} for every UI string.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds /simulator page with live sliders for income change, one-off
expenses, and fixed cost shifts. Goal timelines update in real time
showing months gained/lost. Includes a savings rate bar chart from
historical monthly data.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
