- LEXAI-13: TweetNaCl secretbox encryption for API keys in Options + background
- getOrCreateEncKey() generates per-device 32-byte key stored in chrome.storage.local
- Keys saved as nonce+ciphertext (base64) under apiKeyEnc
- Backward compat: falls back to plaintext apiKey if no encrypted key found
- Lock icon 🔒 shown in Options label when key is encrypted
- LEXAI-11: Right-click context menu with Fix, Rephrase, Shorten, Expand, Tone
- Registered via onInstalled in background service worker
- Sends lexai-context-menu message to content script
- Content script listener added at bottom of main()
- LEXAI-12: Tone analysis button added to floating toolbar (teal #2dd4bf)
- Analysis-only: showModal called with null originalText = no Replace button
- Tone system prompt updated to pure analysis (no rewrite)
Root cause (dual bugs):
1. SCOPE BUG: snapStart/snapEnd/snapElement/snapRange were local vars inside
runAction() but showModal() is a sibling function — those snap vars were
never in scope inside the Replace button handler. The condition always
silently fell through, doing nothing.
2. TIMING BUG: Selection was only captured on document mouseup, which could
race against focus changes when clicking the toolbar.
Fix:
- showModal() now accepts snapStart/snapEnd/snapElement/snapRange as explicit
parameters — guaranteed in-scope, no closure ambiguity
- Each toolbar button mousedown calls captureForButton() BEFORE any focus
shift can occur (belt-and-suspenders, works even if e.preventDefault fails)
- Added console.log debug lines to Replace handler and runAction snapshot
- selectionLocked reset on Escape and overlay click (was missing)
