feat(inspector): resizable panes, arrow-key row navigation, sticky raw attributes and favicon

[gmegidish]

Summary

• Resizable panes: draggable splitters between the device pane, the elements list and the detail pane. col-resize cursor, accent highlight on hover/drag, ←/→ when focused, widths persisted in localStorage. Clamped by CSS min/max-width; splitters are hidden in the stacked layout below 900px.
• Overlay tracking: the screenshot pane uses a ResizeObserver instead of a window resize listener, so element highlights follow the screenshot while dragging.
• Arrow-key navigation: ↑/↓ move the selection between element rows. Focus follows selection, so it also works after clicking an element on the screenshot.
• Sticky Raw Attributes: the expanded/collapsed state survives selecting another row.
• Favicon: same icon as mobilewright.dev, served as /favicon.ico.

Test plan

• npm run lint
• Simulated splitter drags and keyboard resize in Chrome against the static page
• Drag both splitters with a real device screenshot loaded; highlights stay aligned
• Reload: pane widths are restored
• Open Raw Attributes, click another row: stays open
• Click a row or screenshot element, press ↑/↓: selection moves and scrolls into view
• Favicon shows in the browser tab

[coderabbitai]

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: 9d31f3d8-b76e-42c0-926d-e2e787b06c16

📥 Commits

Reviewing files that changed from the base of the PR and between 2cd27c9 and e534a8c.

⛔ Files ignored due to path filters (1)

• packages/inspector/public/favicon.ico is excluded by !**/*.ico

📒 Files selected for processing (3)

• packages/inspector/public/css/app.css
• packages/inspector/public/index.html
• packages/inspector/public/js/app.js

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🧪 Generate unit tests (beta)

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