chore: upgrade Angular 17 → 18 [closes #27]

[yi-hialong]

Summary

Upgrades Angular 17 → 18 as required by issue #27.

Changes

• Upgrade all @angular/* deps to ^18.0.0
• Upgrade typescript to ~5.4.0

Depends On

• PR chore: upgrade Angular 15 → 16 [closes #25] #76 (Angular 15→16) and PR chore: upgrade Angular 16 → 17 [closes #26] #77 (Angular 16→17) must be merged first

Closes #27.

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