⚡ Optimize RemapPanel redundant InputRouter node lookups

[niyazmft]

💡 What: Cached the InputRouter node via a new _get_router() method and a class-level variable _cached_router instead of repeatedly looking it up via get_node_or_null inside loop-intensive functions get_action_icon and get_action_text.
🎯 Why: get_action_text and get_action_icon are called frequently (especially during create_action_list initialization or polling) resulting in unnecessary absolute path tree traversal costs per action in the InputMap.
📊 Measured Improvement: Benchmarked a looping test of 100 fake actions invoking both functions. Baseline execution time was ~1,374,968 us (1.37s). Optimized execution time was ~1,316,907 us (1.31s). This is a measurable ~4.2% overall execution time improvement for this UI polling pattern.

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PR created automatically by Jules for task 11320102254896643776 started by @niyazmft

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[gemini-code-assist]

Code Review

This pull request introduces caching for the InputRouter node in remap_panel.gd to optimize lookups and adds a benchmark script to measure execution time. The review feedback points out that the lazy-loading implementation will repeatedly perform expensive lookups if the router is null (e.g., in unit tests). To resolve this, the reviewer suggests using an @onready variable to fetch the router once and updating all references to use this cached variable directly.

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