Add keyboard navigation to web-awesome report

Implements a full vim-like and NERDTree-like keyboard shortcut system for the Allure report UI.

Infrastructure (web-commons)

• createHotkeyController — scope-aware hotkey dispatcher with editable-element guard and scroll suppression
• matchHotkey — modifier + key/code matching
• flattenVisibleTree / moveFocus — flat tree representation for keyboard traversal
• scrollTreeFocus — scroll-into-view logic for the focused tree item
• Subtree expand/collapse state machine

Global shortcuts

• s — focus search, Escape — blur search / close help
• Shift+L / Ctrl+\ — toggle split layout
• 1–5, Tab/Shift+Tab — switch report root tabs
• [ / ] — switch focus between tree and test result panes
• ? — open hotkeys help dialog

Tree navigation (vim + NERDTree)

• j/k/↑/↓ — move focus, h/l/←/→ — collapse/expand node
• p/u — jump to parent group
• g/G, Home/End — first/last item
• Space/Enter/o — toggle or open focused node
• -/+ — collapse/expand; C/A, Shift+C/Shift+A, >, f — subtree bulk operations
• z/t — scroll tree pane to top
• V/M — toggle report variables / metadata panels
• Switching base → split automatically expands ancestor groups and moves focus to the open test result

Test result pane navigation

• j/k/↑/↓/n/N — next/previous test result
• 1–5, Tab/Shift+Tab — switch test result tabs
• l/p/i — toggle Labels / Parameters / Links sections
• Escape — back to tree