feat: add duplicate removal and fix auto-group/auto-collapse

Additions
- remove-duplicates command (Alt+Shift+R): removes duplicate tabs by
URL, keeps the most recently used, ignores pinned tabs and internal
URLs.
- close-group command (Alt+Shift+C) exposed in shortcuts and options
page.
- Popup: "Auto group" (autoGroupDomains, autoGroupMinTabs) and
"Auto collapse" (autoCollapseOthers, autoCollapseMinTabs) sections,
previously missing from the UI.
- Popup: "Remove duplicate tabs" button.

fix: collect hostless tabs into ungrouped list and collapse new groups on creation

[2.0.1] - 2026-04-17

Changed

• Increase tab reorder delay from 100ms to 400ms in onActivated handler

Changelog
All notable changes to this project will be documented in this file.
[2.0.0] - 2026-04-17
Added
• Cross-window domain grouping: Group all by domain consolidates all non-pinned tabs from every window into the focused one, bucketed by registrable domain (Alt+Shift+G).
• Configurable minimum tabs per domain for grouping (groupMinTabs, default 2).
• Sort ungrouped tabs by title or by domain from the popup.
• Extract current domain to a new window (Alt+Shift+W).
• Extract current domain to a new tab group in the current window (Alt+Shift+T).
• Options page listing keyboard shortcuts; Firefox allows inline editing, Chrome links to chrome://extensions/shortcuts.
• Deterministic group color based on domain hash.
• Auto-reconciliation: opening a tab whose domain matches an existing group joins it; switching to a tab moves it or its group to the leftmost unpinned position.
• Settings synchronized via storage.sync.
Changed
• Ungrouped tabs are now placed before groups in the tab bar (previously after).
• Active tab on activation is moved to pinnedCount (leftmost unpinned), with defensive re-ungroup if absorbed into an adjacent group.
• groupAllByDomain is now idempotent: dissolves all groups first, rebuilds from scratch, avoiding iterative drift across repeated invocations.
• Tab bar ordering inside groups is always by last access (most recent first).
Fixed
• Tabs from unrelated domains no longer absorbed into the currently active group.
• Ungrouped tabs no longer pushed to the right of groups on activation.
• New tabs (about:newtab, chrome://newtab) no longer captured by the active group.
• Internal-URL tabs (about:, chrome:, view-source:, devtools:, etc.) are always kept ungrouped.
[1.5.0] - 2025
Added
• Auto-move active tab to the first unpinned position.
• Basic domain grouping within a single window.
• Pinned tabs preserved; manual drag operations respected.

v1.3.2
Détection du glisser-déposer : le réordonnancement manuel des onglets est désormais préservé
Nettoyage du code transpilé : async/await natif, suppression des polyfills
Déclaration d'absence de collecte de données (consentement intégré Firefox)

v1.3.1

Amélioration de la détection du glisser-déposer : double vérification de la position de l'onglet avant déplacement. Simplification du code.

v1.3.0
Détection du glisser-déposer : le réordonnancement manuel des onglets est désormais préservé
Nettoyage du code transpilé : async/await natif, suppression des polyfills
Déclaration d'absence de collecte de données (consentement intégré Firefox)
Ajout du support Firefox pour Android