Update template-attributes.json with missing attributes and corrections

[uguraslan]

Summary

This is mainly for providing attribute data for Blits dev tools

• Added 9 missing template attributes: src, fit, rtt, effects, placement, inspector-data, wordwrap, key, range
• Fixed incorrect default values for pivot (0 -> 0.5), gap (null -> 0), align-items (null -> "start"), padding (null -> 0), textoverflow (null -> "...")
• Added percentage string support to position/dimension attributes (x, y, w, h, width, height)
• Added object type support for color (gradients) and scale (independent axis)
• Added show enum values and default
• Marked wordwrap as deprecated

[github-actions]

Test Results: ✅ PASSED

Run at: 2026-02-17T19:53:08.340Z

Summary:
passed: 1019 failed: 0 of 1019 tests

[michielvandergeest]

LGTM