Use TypeScript project references for incremental builds (#7180)

* [AI] Fix duplicate typechecking by consolidating into lage

Previously `yarn typecheck` ran:
1. `tsc -b` (type-checks all packages via project references)
2. `tsc -p tsconfig.root.json --noEmit` (checks root bin/*.ts)
3. `lage typecheck` (runs `tsc --noEmit` per package - duplicate!)

Now it runs:
1. `tsc -p tsconfig.root.json --noEmit` (checks root bin/*.ts)
2. `lage typecheck` (handles everything via dependency ordering)

Changes:
- Remove `tsc -b` from root typecheck script
- Add `dependsOn: ["^typecheck"]` to lage config for correct ordering
- Change per-package typecheck from `tsc --noEmit` to `tsc -b` so
  declarations are emitted for dependent packages

https://claude.ai/code/session_01P7mtAHphD6f1FsnQRwWBaW

* Add release notes for PR #7180

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

package.json

@@ -57,7 +57,7 @@
     "lint": "oxfmt --check . && oxlint --type-aware --quiet",
     "lint:fix": "oxfmt . && oxlint --fix --type-aware --quiet",
     "install:server": "yarn workspaces focus @actual-app/sync-server --production",
-    "typecheck": "tsc -b && tsc -p tsconfig.root.json --noEmit && lage typecheck",
+    "typecheck": "tsc -p tsconfig.root.json --noEmit && lage typecheck",
     "jq": "./node_modules/node-jq/bin/jq",
     "prepare": "husky"
   },