Always collect templates for indexing, even if not at toplevel

[JonatanWaern]

Signed-off-by: Jonatan Waern jonatan.waern@intel.com

[Copilot]

Pull request overview

This PR aims to ensure template declarations are collected for indexing even when they appear in non-toplevel (invalid) contexts, improving resilience and editor feedback in broken-syntax scenarios.

Changes:

• Move template tracking into StatementSpec and add recursive gather_templates() to collect templates from nested statement specs.
• Track templates encountered in invalid contexts during hash-if flattening (while still emitting an error).
• Rename from_device_and_bases to templates_from_device_and_bases and update changelog.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
src/analysis/structure/toplevel.rs	Adds templates to StatementSpec, tracks templates during flattening, and provides recursive template gathering.
src/analysis/structure/objects.rs	Adjusts scope collection to include template scopes from statement lists.
src/analysis/mod.rs	Renames and updates template collection helper to use TopLevel::gather_templates().
CHANGELOG.md	Documents the improved indexing behavior for templates in invalid contexts.

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