feat(frontend): A4 — FundamentalsPanel v1 (quarter tape + earnings + peers)

Reshapes FundamentalsPanel to consume the additive API v1, within the app's
existing dark-glass language.

- types.ts updated to the exact v1 shape (metrics/earnings/valuation/reads +
  legacy fields preserved).
- The quarter tape is the single distinctive device: per-metric 4-cell tape
  (revenue/EPS growth, operating + FCF margin, share count) with the latest cell
  toned by the deterministic read; color is always paired with the read text.
- Restrained peer strips for Net debt/EBITDA, P/E, FCF yield: value + a
  polarity-aware percentile bar with a median marker + the read; hidden ("peers
  n/a") when industry is null (< 5 peers).
- Earnings: next date/session/countdown + last-N beat/miss arrows (▲/▼/·) with
  text aria-labels; explicit "no date" state.
- Explicit n/a, insufficient-peer, and no-earnings states; header shows the
  deterministic sentence. Removed the hard-coded "FMP" source label.

Frontend tsc -b passes; backend suite 778 passed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/types.ts

@@ -703,8 +703,74 @@ export interface SentimentResponse {
 }
 
 // Fundamentals
+export interface MetricIndustry {
+  label: string;
+  median: number;
+  favorable_percentile: number; // 0-100, polarity-aware (higher = more favorable)
+  peer_count: number;
+}
+
+export interface MetricHistoryPoint {
+  period_end: string | null; // YYYY-MM-DD
+  value: number | null;
+}
+
+export type MetricKey =
+  | 'revenue_growth_yoy'
+  | 'eps_growth_yoy'
+  | 'operating_margin'
+  | 'fcf_margin'
+  | 'net_debt'
+  | 'net_debt_to_ebitda'
+  | 'share_count_change_yoy';
+
+export interface MetricItem {
+  key: MetricKey;
+  value: number | null;
+  history: MetricHistoryPoint[];
+  industry: MetricIndustry | null;
+  period_end: string | null;
+  filed_date: string | null;
+  source: string; // 'sec' | 'legacy_api'
+}
+
+export interface EarningsNext {
+  date: string;
+  session: string; // bmo | amc | unknown
+  days_until: number;
+}
+
+export interface EarningsRecent {
+  announce_date: string;
+  period_end: string | null;
+  eps_estimate: number | null;
+  eps_actual: number | null;
+  surprise_pct: number | null;
+}
+
+export interface EarningsObject {
+  next: EarningsNext | null;
+  recent: EarningsRecent[];
+}
+
+export interface Valuation {
+  pe: number | null;
+  fcf_yield: number | null;
+  market_cap_est: number | null;
+  pe_industry: MetricIndustry | null;
+  fcf_yield_industry: MetricIndustry | null;
+  price_date: string | null;
+}
+
+export interface FundamentalsReads {
+  header: string | null;
+  // fixed map over every metric key plus 'pe' and 'fcf_yield'; null when unavailable
+  by_key: Record<string, string | null>;
+}
+
 export interface FundamentalResponse {
   symbol: string;
+  // legacy fields (unchanged)
   pe_ratio: number | null;
   revenue_growth: number | null;
   earnings_surprise: number | null;
@@ -712,6 +778,11 @@ export interface FundamentalResponse {
   next_earnings_date: string | null;
   fetched_at: string | null;
   unavailable_fields: Record<string, string>;
+  // additive v1 (SEC/Dolt-derived) — present, with null/empty when unavailable
+  earnings: EarningsObject | null;
+  metrics: MetricItem[] | null;
+  valuation: Valuation | null;
+  reads: FundamentalsReads | null;
 }
 
 // Indicators