feat(macroplan): vendor plan model and grid from the macroplan app

Copied verbatim (imports resorted) from jclab/macroplan so future
upstream syncs stay copy-paste; extraction to a shared package is
deferred until drift hurts.

pnpm-lock.yaml

@@ -137,6 +137,12 @@ importers:
       shikiji-core:
         specifier: 0.10.2
         version: 0.10.2
+      smol-toml:
+        specifier: ^1.7.0
+        version: 1.7.0
+      valibot:
+        specifier: ^1.4.2
+        version: 1.4.2(typescript@5.9.3)
       vue:
         specifier: ^3.5.18
         version: 3.5.18(typescript@5.9.3)
@@ -5933,6 +5939,10 @@ packages:
     resolution: {integrity: sha512-KAkBqZl3c2GvNgNhcoyJae1aKldDW0LO279wF9bk1PnluRTETKBq0WyzRXxEhoQLk56yHaOY4JCBEKDuJIET5g==}
     engines: {node: '>=20.0.0'}
 
+  smol-toml@1.7.0:
+    resolution: {integrity: sha512-aqVvWoyO21L23mb+drl4RmMXbf6N7FdHjAhTRA9ZBL7apWBgfWC16KjrASI+1p9GAroljyMHj6fK67i0UiTNvQ==}
+    engines: {node: '>= 18'}
+
   snapdragon-node@2.1.1:
     resolution: {integrity: sha512-O27l4xaMYt/RSQ5TR3vpWCAB5Kb/czIcqUFOM/C4fYcLnbZUc1PkjTAMjof2pBWaSTwOUd6qUHcFGVGj7aIwnw==}
     engines: {node: '>=0.10.0'}
@@ -6449,6 +6459,14 @@ packages:
     deprecated: uuid@10 and below is no longer supported.  For ESM codebases, update to uuid@latest.  For CommonJS codebases, use uuid@11 (but be aware this version will likely be deprecated in 2028).
     hasBin: true
 
+  valibot@1.4.2:
+    resolution: {integrity: sha512-gjdCvJ6d3RyHAneqxMYMW9QMCwYMb3jpOO0IyHZV1bnRHFBHrX3VkIILt5XYR0WhwHiH7Mty8ovuPZ/O3gamrg==}
+    peerDependencies:
+      typescript: '>=5'
+    peerDependenciesMeta:
+      typescript:
+        optional: true
+
   validate-npm-package-license@3.0.4:
     resolution: {integrity: sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==}
 
@@ -13005,6 +13023,8 @@ snapshots:
 
   smob@1.6.1: {}
 
+  smol-toml@1.7.0: {}
+
   snapdragon-node@2.1.1:
     dependencies:
       define-property: 1.0.0
@@ -13533,6 +13553,10 @@ snapshots:
 
   uuid@8.3.2: {}
 
+  valibot@1.4.2(typescript@5.9.3):
+    optionalDependencies:
+      typescript: 5.9.3
+
   validate-npm-package-license@3.0.4:
     dependencies:
       spdx-correct: 3.2.0