migrate timer logic into own file + start of tests

[timwhite06]

No description provided.

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	53.07%	526 / 991
🔵	Statements	53.07%	526 / 991
🔵	Functions	73.33%	33 / 45
🔵	Branches	88.11%	89 / 101

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/App.vue	8.78%	82.97%	70.58%	8.78%	1-264
src/hooks/useTimer.ts	100%	100%	100%	100%

Generated in workflow #4 for commit d6da997 by the Vitest Coverage Report Action