[Amber (YuanboXue-Amber)]

Fix observed-element lookup to skip ineligible duplicates and return the first eligible match. Apply accessibility filters to deferred waits, with five regression cases and updated docs.

Validation: 27 observed-element/cross-origin tests and 23 shadow DOM tests passed; build, type-check, lint, and formatting passed.

[github-actions]

📊 Bundle size report

Package & Exports	Baseline (minified/GZIP)	PR	Change
tabster all exports	110.948 kB 30.14 kB	110.957 kB 30.152 kB	9 B 12 B
tabster getCrossOrigin	107.881 kB 29.426 kB	107.89 kB 29.439 kB	9 B 13 B
tabster getObservedElement	44.334 kB 13.138 kB	44.343 kB 13.149 kB	9 B 11 B

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
tabster createTabster (core)	38.569 kB 11.569 kB
tabster focusable.findAll	38.592 kB 11.577 kB
tabster focusable.findLast	38.593 kB 11.577 kB
tabster focusable.findNext	38.593 kB 11.577 kB
tabster focusable.findPrev	38.593 kB 11.577 kB
tabster getDeloser	47.93 kB 13.853 kB
tabster getGroupper	45.671 kB 13.236 kB
tabster getModalizer	47.596 kB 13.995 kB
tabster getMover	53.128 kB 15.489 kB
tabster getOutline	47.204 kB 13.807 kB
tabster getRestorer	41.154 kB 12.166 kB

_{🤖 This report was generated against cc60426d5ab690bc33f01fb39144f2afd9d3ef0e}