[kanchingyg]

Closes #972

In src/build.ts, hooks.callHook('build:prepare', context) ran once before rolldownWatch started, whereas build:done ran after every rebuild in postBuild().

This change invokes await hooks.callHook('build:prepare', context) on START watcher events when hasBuilt is true so build:prepare runs before each rebuild in watch mode.

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tsdown

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commit: dd6ead5