chore: require bug reporters to verify against latest main

Add a required checkbox to the bug report template asking reporters
to confirm the issue still occurs when built from the latest main
branch. This reduces duplicate reports for bugs that have already
been fixed but not yet released.

Also update the version field label to clarify that the commit hash
from `phpantom_lsp --version` is expected when built from source.

Author: calebdw

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -7,12 +7,26 @@ body:
       value: |
         Thanks for taking the time to report a bug! Please fill out the sections below so we can reproduce and fix the issue quickly.
 
+        **Before submitting**, please verify that the bug still occurs on the latest `main` branch. PHPantom is under active development and the issue may already be fixed. You can install the latest `main` with:
+
+        ```
+        cargo install --git https://github.com/PHPantom-dev/phpantom_lsp --branch main phpantom_lsp
+        ```
+
+  - type: checkboxes
+    id: latest-version
+    attributes:
+      label: Verified on latest main
+      options:
+        - label: I have confirmed this bug still occurs when built from the latest `main` branch.
+          required: true
+
   - type: input
     id: version
     attributes:
-      label: PHPantom version
+      label: PHPantom version / commit
       description: |
-        Paste the output of `phpantom_lsp --version`. This prints the exact release tag or commit hash.
+        Paste the output of `phpantom_lsp --version`. When built from source this includes the commit hash (e.g. `0.9.0-14-g3fdd93b`).
     validations:
       required: true