Increase VectorEngine timeouts and add image UI

Add VectorEngine image generation config and raise request timeouts (env + scripts) from 180000 to 1000000ms. Introduce a reusable CreativeImageInputPanel component with tests and wire up mobile keyboard-focus helpers; update generation views and related tests (CustomWorldGenerationView, BarkBattle editor, Match3D, Puzzle flows). Improve API error handling / VectorEngine request guidance (packages/shared http.ts and docs), and apply multiple backend/frontend fixes for puzzle/match3d/prompt handling. Also include extensive docs and decision-log updates describing UI/UX decisions and verification steps.

packages/shared/src/contracts/puzzleAgentActions.ts

@@ -51,6 +51,7 @@ export type PuzzleAgentActionRequest =
       workDescription?: string;
       pictureDescription?: string;
       referenceImageSrc?: string | null;
+      referenceImageSrcs?: string[];
       imageModel?: string | null;
       aiRedraw?: boolean;
     }
@@ -61,6 +62,7 @@ export type PuzzleAgentActionRequest =
       workDescription?: string;
       pictureDescription?: string;
       referenceImageSrc?: string | null;
+      referenceImageSrcs?: string[];
       imageModel?: string | null;
       aiRedraw?: boolean;
       candidateCount?: number;
@@ -70,6 +72,7 @@ export type PuzzleAgentActionRequest =
       levelId?: string | null;
       promptText?: string | null;
       referenceImageSrc?: string | null;
+      referenceImageSrcs?: string[];
       imageModel?: string | null;
       aiRedraw?: boolean;
       candidateCount?: number;