fix(finance): i18n — fix TOML duplicate key and missing Lang on Translator

- Remove conflicting `analysis = "..."` scalar from [nav] in both
  en.toml and pt.toml; it shadowed the [nav.analysis] sub-table,
  causing the TOML parser to reject the entire file at startup
- Update nav analysis dropdown label to reuse nav.drawer.analysis_label
- Add lang field to Translator and expose T.Lang() method so base.html
  can highlight the active language in the switcher without requiring
  a Lang field on every page data struct

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/finance/services/api/main/i18n.go

@@ -65,6 +65,7 @@ func flattenTOML(prefix string, node map[string]any, out catalogue) {
 // Translator wraps a locale lookup and exposes a Get method callable from
 // Go templates as {{.T.Get "key"}}.
 type Translator struct {
+	lang string
 	cat  catalogue
 	en   catalogue
 }
@@ -79,13 +80,19 @@ func (tr *Translator) Get(key string) string {
 	return key
 }
 
+// Lang returns the active language code for use in templates (e.g. {{.T.Lang}}).
+func (tr *Translator) Lang() string {
+	return tr.lang
+}
+
 // newT returns a Translator for the given language.
 func newT(lang string) *Translator {
 	cat, ok := catalogues[lang]
 	if !ok {
+		lang = defaultLang
 		cat = catalogues[defaultLang]
 	}
-	return &Translator{cat: cat, en: catalogues[defaultLang]}
+	return &Translator{lang: lang, cat: cat, en: catalogues[defaultLang]}
 }
 
 // detectLang reads the lang from a cookie, falling back to Accept-Language,

apps/finance/services/api/main/locales/en.toml

@@ -8,7 +8,6 @@ portfolio      = "Portfolio"
 goals          = "Goals"
 property       = "Property"
 people         = "People"
-analysis       = "Analysis"
 settings       = "Settings"
 business       = "🏢 Business"
 hub_back       = "← Hub"

apps/finance/services/api/main/locales/pt.toml

@@ -8,7 +8,6 @@ portfolio      = "Carteira"
 goals          = "Objetivos"
 property       = "Imóveis"
 people         = "Pessoas"
-analysis       = "Análise"
 settings       = "Definições"
 business       = "🏢 Empresa"
 hub_back       = "← Hub"

apps/finance/services/api/main/templates/base.html

@@ -584,7 +584,7 @@
     {{$analysisActive := or (eq .Route "reports") (eq .Route "projections") (eq .Route "networth") (eq .Route "simulator") (eq .Route "tax")}}
     <div class="nav-group">
       <button class="nav-group-btn {{if $analysisActive}}active{{end}}">
-        {{.T.Get "nav.analysis"}} <svg viewBox="0 0 10 6" fill="none" stroke="currentColor" stroke-width="1.5"><path d="M1 1l4 4 4-4"/></svg>
+        {{.T.Get "nav.drawer.analysis_label"}} <svg viewBox="0 0 10 6" fill="none" stroke="currentColor" stroke-width="1.5"><path d="M1 1l4 4 4-4"/></svg>
       </button>
       <div class="nav-dropdown">
         <a href="/reports"     class="{{if eq .Route "reports"}}active{{end}}">{{.T.Get "nav.analysis.reports"}}</a>
@@ -614,8 +614,8 @@
     <span class="nav-email">{{.Email}}</span>
     <form method="POST" action="/lang" style="display:inline;">
       <select name="lang" onchange="this.form.submit()" style="font-size:12px; background:var(--bg2); color:var(--text2); border:1px solid var(--border2); border-radius:var(--radius-sm); padding:4px 6px; cursor:pointer;">
-        <option value="en" {{if eq .Lang "en"}}selected{{end}}>EN</option>
-        <option value="pt" {{if eq .Lang "pt"}}selected{{end}}>PT</option>
+        <option value="en" {{if eq (.T.Lang) "en"}}selected{{end}}>EN</option>
+        <option value="pt" {{if eq (.T.Lang) "pt"}}selected{{end}}>PT</option>
       </select>
     </form>
     <button class="theme-btn" id="theme-toggle" title="{{.T.Get "nav.theme.toggle_title"}}">🌙</button>