Patch Changes

• perf: optimize parser hot paths for faster compilation (#17811)

• fix: SvelteMap incorrectly handles keys with undefined values (#17826)

• fix: SvelteURL search setter now returns the normalized value, matching native URL behavior (#17828)

• fix: visit synthetic value node during ssr (#17824)

• fix: always case insensitive event handlers during ssr (#17822)

• chore: more efficient effect scheduling (#17808)

• perf: optimize compiler analysis phase (#17823)

• fix: skip redundant batch.apply (#17816)

• chore: null out current_batch before committing branches (#17809)