fix: restore fence tool handlers dropped by null-guard commit

[wass08]

Summary

251af2c ("fix: add null guards for cursorRef in fence and wall tool click handlers", merged in #315 / portforward of pr-309) added a ?. on cursorRef.current in onGridClick, but the same commit accidentally deleted:

• the closing braces of the else branch and onGridClick itself, leaving the function syntactically unterminated, and
• the trailing reset block (previewRef.current.visible = false, buildingState.current = 1, setDraftMeasurement(null)), and
• the onKeyDown / onKeyUp / onCancel handler definitions — which are still referenced at the emitter.on(...) / emitter.off(...) sites below.

This left main failing to build:

src/fence/tool.tsx(527,4): error TS1128: Declaration or statement expected.
src/fence/tool.tsx(527,12): error TS1005: ';' expected.
…
src/fence/tool.tsx(518,31): error TS2552: Cannot find name 'onCancel'.
src/fence/tool.tsx(519,40): error TS2552: Cannot find name 'onKeyDown'.
src/fence/tool.tsx(520,38): error TS2552: Cannot find name 'onKeyUp'.

Restores the deleted block verbatim from the prior state (5bd2f51), keeping the intended cursorRef.current?. optional-chaining null guard.

Test plan

• bun typecheck (passes)
• bun run build (passes — both editor packages and downstream community app)
• Smoke-test fence tool in the editor: place a fence, continue placing successive segments, press Esc to cancel, hold Shift for angle snap

🤖 Generated with Claude Code

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Project	Status	Preview	Updated (UTC)
pascal	🔴 Failed	–	May 20, 2026, 12:31 PM

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