--- WHAT'S NEW IN V1.2.0 ---
1. Shadow DOM Encapsulated HUD: The on-page timer is encapsulated in an isolated Shadow DOM with a MutationObserver to ensure it remains permanently visible on dynamic Single Page Applications (SPAs) during live user interactions.
2. Dynamic Color Progress Indicator: Added a real-time progress line beneath the on-page countdown (Green >50% → Amber 25-50% → Red <25%) that updates live when timer extensions or activity resets occur.
3. Persistent Audio Mute Button: The on-page sound toggle (🔊/🔇) updates audio state in-place without unmounting, flickering, or hiding the widget.
4. Compact Executive Popup UI: Redesigned the popup with streamlined card hierarchy, fluid responsive scaling, and merged Text Detection & Sound Alerts into one unified card.
5. 100% Safe DOM Construction: Removed all innerHTML assignments across content and popup scripts, constructing all elements using native DOM APIs for complete security compliance.

--- CORE FUNCTIONALITY ---
• Refresh Routing: Reload active tab or navigate to specific target URLs.
• Intervals: Fixed intervals and randomized interval ranges.
• Bypass Cache: Force hard reloads directly from origin servers.
• Smart Activity Detection: Automatically delays or resets timer when users type, click, or scroll.
• Text Detection Engine: Scans page text for "Word Found" (present) or "Word Missing" (absent) conditions with preloaded quick-selection keyword chips.
• Dual Sound Alert Engine: Plays synthesized Web Audio tones or user-uploaded audio files (.mp3, .wav, .ogg) via privileged background execution.
• Sleep-Proof Execution: Uses alarms API and navigation error listeners for continuous, uninterrupted operation.

--- PERMISSION JUSTIFICATIONS ---
• "activeTab": Accesses and reloads active tab upon user trigger.
• "tabs": Queries tab state and updates URLs in Target Link mode.
• "storage": Persists user preferences locally in chrome.storage.local.
• "alarms": Prevents background throttling and ensures timer reliability.
• "scripting": Injects the Shadow DOM floating timer HUD and keyword scanning logic.
• "notifications": Dispatches system alerts when text triggers match.
• "webNavigation": Detects navigation completions and auto-recovers from network drops.
• "<all_urls>": Enables refresh and keyword monitoring across user-selected websites.

--- TESTING INSTRUCTIONS ---
1. Open any webpage (e.g., https://example.com) and click extension icon.
2. Set Fixed Interval (e.g., 5s) and click "START".
3. Verify tab reloads, popup timer ticks, and the on-page timer bar displays with a dynamic color line.
4. On the on-page bar, click the Mute button (🔊/🔇) — verify audio state toggles in-place without hiding the widget.
5. Interact with the page (typing or scrolling) to verify that Activity Detection extends or resets the timer smoothly.
6. In popup, enable "Text Detection & Audio Alerts", select "W

--- WHAT'S NEW IN V1.2.0 ---
1. Redesigned On-Page Timer Bar: Pinned to the top-right with an expanded, high-legibility layout, live countdown, dynamic color-shifting progress line (Green >50% → Amber 25-50% → Red <25%), and a persistent in-place sound mute/unmute toggle.
2. Unified Settings Interface: Merged Text Detection and Audio Alerts into a single, cohesive settings card for streamlined configuration.
3. Enhanced Background Engine: Eliminated timer desync and page freeze edge cases using wall-clock timestamp tracking (Date.now()) and robust message routing.

--- CORE FUNCTIONALITY ---
• Refresh Routing: Reload active tab or navigate to specific target URLs.
• Intervals: Fixed intervals and randomized interval ranges.
• Bypass Cache: Force hard reloads directly from origin servers.
• Smart Activity Detection: Automatically delays refresh when users type, click, or scroll.
• Text Detection Engine: Scans page text for "Word Found" (present) or "Word Missing" (absent) conditions with preloaded quick-selection keyword chips.
• Dual Sound Alert Engine: Plays synthesized Web Audio tones or user-uploaded audio files (.mp3, .wav, .ogg) via privileged background execution to bypass browser autoplay limits.
• Sleep-Proof Execution: Uses alarms API and navigation error listeners for uninterrupted, continuous operation.

--- PERMISSION JUSTIFICATIONS ---
• "activeTab": Accesses and reloads active tab upon user trigger.
• "tabs": Queries tab state and updates URLs in Target Link mode.
• "storage": Persists user preferences locally in chrome.storage.local.
• "alarms": Prevents background throttling and ensures timer reliability.
• "scripting": Injects the on-page floating timer HUD and keyword scanning logic.
• "notifications": Dispatches system alerts when text triggers match.
• "webNavigation": Detects navigation completions and auto-recovers from network drops.
• "<all_urls>": Enables refresh and keyword monitoring across user-selected websites.

1. Open any page (e.g., https://example.com) and open extension popup.
2. Set Fixed Interval (e.g., 5s) and click "START".
3. Verify the tab reloads every 5s, popup timer ticks, and the on-page header bar displays with a dynamic color line.
4. On the on-page bar, click the Mute button (🔊/🔇) — verify audio state toggles in-place without hiding the widget.
5. In popup, enable "Text Detection & Audio Alerts", select "Word Found", enter "Example", and click START.
6. Verify alert audio plays, a system notification appears, and the refresher halts.
7. Test "Activity Detection" (type on page to delay timer) and "Bypass Cache".

--- SECURITY & PRIVACY ---
• No Remote Code: Contains zero external scripts, CDNs, or eval().
• Zero Data Collection: No user data or browsing history is tracked or transmitted (data collection declared as "none").
• Safe DOM: Floating HUD elements are built using document

Hello Review Team,

Thank you for reviewing Auto Refresh Plus - Page Refresher (v1.1.0).

--- FUNCTIONALITY SUMMARY ---
Auto Refresh Plus automates web page reloads with customizable controls:
1. Refresh Modes: Reload active tab or a specific target URL.
2. Intervals: Supports fixed intervals and randomized interval ranges.
3. Bypass Cache: Option to force hard reload from origin server.
4. Smart Activity Detection: Automatically delays refresh when user types, clicks, or scrolls.
5. On-Page Floating HUD: Draggable widget with live countdown, pause/resume, restart, sound mute, and stop buttons.
6. Text Detection Engine: Scans page text for "Word Found" (present) or "Word Missing" (absent) conditions with preloaded quick-selection keywords and custom input.
7. Notification & Sound: Emits native browser notifications and plays alert sounds (built-in synthesized Web Audio tones or uploaded custom audio files) via background execution.
8. Background Reliability: Uses alarms API and navigation error listeners for uninterrupted, sleep-proof operation.

--- PERMISSION JUSTIFICATIONS ---
• "activeTab": Accesses and reloads active tab upon user trigger.
• "tabs": Queries tab state and updates URLs in Target Link mode.
• "storage": Persists user preferences locally in chrome.storage.local.
• "alarms": Prevents execution throttling and ensures background timer reliability.
• "scripting": Injects draggable on-page HUD and text scanning logic.
• "notifications": Dispatches system alerts when text triggers match.
• "webNavigation": Detects navigation completions and auto-recovers from network drops.
• "<all_urls>": Enables refresh and keyword monitoring on user-selected sites.

--- TESTING INSTRUCTIONS ---
1. Open any page (e.g., https://example.com) and click extension icon.
2. Set Fixed Interval (e.g., 5s) and click "START".
3. Verify tab reloads every 5s, popup timer ticks, and on-page floating HUD appears.
4. Test on-page HUD: Click Pause (⏸), Resume (▶), Restart (🔄), Mute (🔊/🔇), and drag badge.
5. In popup, enable "Text Detection Monitor", select "Word Found", enter "Example", and click START.
6. Verify alert sound plays, system notification appears, and refresher stops.
7. Test "Activity Detection" (type on page to delay timer) and "Bypass Cache".

--- SECURITY & PRIVACY ---
• No Remote Code: Contains no external scripts, remote CDNs, or eval().
• Zero Data Collection: No user data or browsing history is tracked or transmitted (data collection declared as "none").
• Safe DOM: Floating HUD is built using document.createElement without unsafe innerHTML.