Proton Mail replaced anchor-based list rows with click-handled divs, which broke every row-matching path in the extension. This rewrites row detection to use Proton's current DOM markers.

Changes

• getMessageRows() → selects [data-shortcut-target="item-container"] (no more anchor/class heuristics)
• getSelectedRow() → finds the row with the item-is-selected class (fallback: data-shortcut-target-selected="true")
• isViewingEmail() → checks for a visible [data-shortcut-target="message-container"]
• Row identity is now tracked via data-element-id instead of URL matching (Proton no longer uses <a href> for list rows)
• clickRow() dispatches events directly on the row div
• Removed isVisible filter from row lookup — Proton's virtualized list reports zero-size bounding rects for rows that are still user-visible and clickable
• Bumped version to 1.1.3

Fix false auto-advance triggers during email selection
- Narrow button detection selector from '[aria-label], [title]' to only button, [role="button"]' to avoid false positives on generic elements
- Remove 'remove' from delete regex — too broad, matched checkbox labels like "Remove from selection", now uses word-bounded delete/trash/bin
- Add isViewingEmail() guard to armAdvance so it only fires when a specific email is open (URL matches a row); prevents triggering in list view during multi-select or checkbox interactions
- Cancel pending advance if URL changes to a URL already in the row list, distinguishing user-initiated navigation from post-delete navigation
- Timeout fallback now only advances if the previous email row is actually gone from the list, not just because 900ms elapsed