fix(analysis): fix API field mismatch and enable full game analysis

Map raw backend response (evaluation/continuationMoves) to frontend
model (eval/winChance/continuations). Add getFenHistory() call after
loading a game or PGN so runAnalysis() gets per-ply FEN history and
triggers analyzeGame() instead of falling back to single-position
analysis. Remove !hasAnnotations guard so positionAnalysis card shows
even when a game is loaded.

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

src/app/pages/analysis/analysis.component.ts

@@ -2,7 +2,7 @@ import { Component, DestroyRef, inject, OnInit } from '@angular/core';
 import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import { ActivatedRoute, RouterLink } from '@angular/router';
 import { FormsModule } from '@angular/forms';
-import { switchMap, of } from 'rxjs';
+import { switchMap, of, forkJoin } from 'rxjs';
 
 import { ChessBoardComponent } from '../../components/chess-board/chess-board.component';
 import { EvalTimelineComponent } from '../../components/eval-timeline/eval-timeline.component';
@@ -146,6 +146,7 @@ export class AnalysisComponent implements OnInit {
       return;
     }
     this.analysing = true;
+    this.positionAnalysis = null;
     this.errorMessage = '';
     const sans =
       this.annotatedMoves.length > 0
@@ -207,12 +208,7 @@ export class AnalysisComponent implements OnInit {
   private applyGame(game: GameFull): void {
     this.game = game;
     this.currentFen = game.state.fen;
-    // Build a flat FEN history from scratch using moves array
-    // The server gives us the final FEN. We reconstruct history by
-    // storing the final FEN; full per-ply history requires per-move API calls
-    // which is out of scope here — we store what we have and allow analysis to proceed.
     this.fenHistory = [game.state.fen];
-    // Seed annotated moves with san strings, no quality yet
     this.annotatedMoves = game.state.moves.map((san) => ({
       san,
       fen: game.state.fen,
@@ -223,6 +219,16 @@ export class AnalysisComponent implements OnInit {
       winChanceBefore: null,
       winChanceAfter: null,
     }));
+    this.gameApi
+      .getFenHistory(game.gameId)
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe({
+        next: (fens) => {
+          if (fens.length >= 2) {
+            this.fenHistory = fens;
+          }
+        },
+      });
   }
 
   private analyseSinglePosition(fen: string): void {