fix(helm): make image.tag or image.digest mandatory

[jopsap]

Summary

• Removes the silent fallback to appVersion in the image helper
• Deployments without an explicit image.tag or image.digest now fail at render time with a clear error instead of silently using whatever appVersion is set to
• If both image.tag and image.digest are provided, digest takes precedence (unchanged behaviour)
• Bumps chart patch version

[coderabbitai]

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