fix: restore Pomodoro duration pointer targets (#2301)

[callumalpass]

Summary

• Bring forward the previously prepared, unmerged Pomodoro timer display is not clickable: timer-overlay sets pointer-events: none and the display/input never restore it #2301 fix: restore pointer events on the duration display and input, retaining the click-through overlay.
• Add three CSS regression assertions and thank @minnyee in unreleased notes.

Validation

• Reproduced in running Obsidian test vault before fix: display computed pointer-events was none and center hit-test missed the display.
• After build:test and plugin reload: pointer-events auto, center hit-test reaches display, click dispatched to that target opens and focuses the visible input with pointer-events auto.
• Three regression tests, full lint, typecheck and build:test passed.
• dev:errors contained an Electron remote setIgnoreMenuShortcuts/object-destroyed error; no claim of a clean error log.
• Restored original test-vault plugin artifacts and reloaded after smoke testing.

Refs #2301; leave open for release closeout. No release published.