Add print view, board info card and document logo upload

- Seitenansicht (/projects/:projectId/print): tabular cover page, board
  overview with supply structure and power sums, one plan per board with a
  repeating title block; PDF via the browser print dialog with named @page
  rules (A4 portrait cover, A4/A3 landscape plans, page x of y).
- Distribution-board info card (board number, location, fed-from, remark)
  in the board edit dialog, persisted through the additively extended
  distribution-board.update command (migration 0008, snapshot schema 6,
  legacy subtree commands normalized).
- Global document logo upload (PNG/JPEG/SVG, max 2 MB) outside project
  revisions and snapshots.
- fed-from stays free text; the overview hierarchy and cumulated sums are
  preliminary until the feed link is modeled.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/project-snapshot.repository.test.ts

@@ -377,6 +377,67 @@ describe("project snapshot repository", () => {
       context.close();
     }
   });
+
+  it("restores snapshots stored with an older supported schema version", () => {
+    const context = createTestDatabase();
+    try {
+      const repository = new ProjectSnapshotRepository(context.db);
+      const snapshot = repository.createNamed({
+        projectId: "project-1",
+        expectedRevision: 0,
+        name: "Vor dem Update",
+      });
+      assert.ok(snapshot);
+      // Rewrite the stored payload into the previous (version 5) shape, as it
+      // exists for snapshots created before the current version.
+      const payload = JSON.parse(
+        context.db
+          .select({ payloadJson: projectSnapshots.payloadJson })
+          .from(projectSnapshots)
+          .where(eq(projectSnapshots.id, snapshot.id))
+          .get()!.payloadJson
+      ) as {
+        schemaVersion: number;
+        project: Record<string, unknown>;
+        distributionBoards: Array<Record<string, unknown>>;
+      };
+      payload.schemaVersion = 5;
+      for (const field of ["siteAddress", "workStage", "projectLead", "projectEditor"]) {
+        delete payload.project[field];
+      }
+      for (const board of payload.distributionBoards) {
+        for (const field of ["boardNumber", "location", "fedFrom", "remark"]) {
+          delete board[field];
+        }
+      }
+      const payloadJson = JSON.stringify(payload);
+      context.db
+        .update(projectSnapshots)
+        .set({
+          schemaVersion: 5,
+          payloadJson,
+          payloadSha256: crypto
+            .createHash("sha256")
+            .update(payloadJson)
+            .digest("hex"),
+        })
+        .where(eq(projectSnapshots.id, snapshot.id))
+        .run();
+
+      const prepared = repository.prepareRestore("project-1", snapshot.id);
+      assert.ok(prepared);
+      const targetState = prepared.command.payload.targetState;
+      assert.equal(targetState.schemaVersion, projectStateSnapshotSchemaVersion);
+      assert.ok(targetState.distributionBoards.length > 0);
+      assert.ok(
+        targetState.distributionBoards.every(
+          (board) => board.boardNumber === null && board.fedFrom === null
+        )
+      );
+    } finally {
+      context.close();
+    }
+  });
 });
 
 describe("portable project transfer", () => {