"Create the best eggless tea cake recipe in metric units. It should be super soft, spongy, moist, and tender, but sturdy enough that it does not crumble easily when sliced or handled. Make it suitable for tea time, with a balanced sweetness and a light vanilla flavor. Prioritize a fine, even crumb and good structure. Include exact gram weights for ingredients, a detailed step-by-step method, oven temperature, pan size recommendation, baking time, doneness cues, cooling time, texture notes, and troubleshooting for dryness, crumbling, dense texture, and sinking. Use metric units only."