Fix Molang parser treating namespaced identifiers as expressions (#149)

The Molang diagnoser was throwing errors on valid resource identifiers
like `minecraft:geometry.full_block` because the regex matched
`geometry.` anywhere in the string, treating namespaced identifiers as
Molang expressions.

## Changes

- **Modified regex pattern** in
`packages/molang/src/molang/functions.ts`
  - Added negative lookbehind `(?<!:)` to prevent matching after colons
- Pattern now correctly distinguishes `minecraft:geometry.full_block`
(identifier) from `geometry.custom` (Molang)

- **Added test coverage** in
`packages/molang/test/data/dataset-lookslike.ts`
- Tests for `namespace:geometry.*`, `namespace:texture.*`,
`namespace:material.*` patterns

## Example

```typescript
// Before: Both matched as Molang
isMolang('minecraft:geometry.full_block')  // true ❌
isMolang('geometry.custom')                 // true

// After: Only valid Molang matches
isMolang('minecraft:geometry.full_block')  // false ✓
isMolang('geometry.custom')                 // true ✓
```

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<details>

<summary>Original prompt</summary>

> There are errors being thrown by the diagnoser because of invalid
molang:
> 
> minecraft:geometry.full_block
> 
> However this is valid, but probally shouldn't tried to parsed or add
the to list of resources used


</details>



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ide/vscode/src/version.ts

@@ -1 +1 @@
-export const Version = "9.0.8";
+export const Version = "9.0.9";