Update README recent features

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• ci: add packaged startup checks and version-gated releases

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• fix: select macOS 26 SDK for CI packaging

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• fix: share OpenAI credentials across translation kernels

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• fix: match zoom controls rounding to pager

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• feat: support custom language codes and streamline regression tests

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• feat: add information categories, release updates and provider availa…

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• feat: improve settings, diagnostics and reader UX

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• feat: configure kernel translation services and developer diagnostics

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• feat: reduce background resource usage and default to reading mode

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• fix: sanitize PDF outline titles and use platform file manager labels

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• fix: auto-hide outline and annotation sidebar scrollbars

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• fix: prevent Windows startup blank screen from preload cycle

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• fix: recognize topic sentences across indented paragraphs and PDF lay…

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• dev: prioritize core regression coverage and reduce tests to 29

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• feat: add reading emphasis and simplify document menus

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• feat: add persistent page edits and improve reader navigation

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• ui: refine sidebar controls and outline disclosure interactions

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• Preserve page shadows around cropped page boundaries

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• Verify Fast CJK layout cache invalidation

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• Improve page cropping, translation scheduling, and CJK paragraph inde…

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• fix: align bidirectional link buttons with comment rail

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• ux: use neutral progress for cached translation loading

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• fix: unify return controls and save kernel paragraph links

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• fix: reuse translation caches across layout-only updates

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• fix: animate outline and annotation insets with titlebar

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