[codex] Improve screen reliability and debug visibility

[devon7y]

What changed

• added screenshot preparation and recompression so screen-analysis requests stay under the vision image limit
• widened screen intent detection for phrasings like what is on my screen
• added a live debug-log stream on the backend plus a debug drawer in the frontend UI
• expanded project discovery beyond ~/Desktop to common local dev roots and the current repo
• replaced the fixed St. Petersburg weather lookup with IP-based location detection, Celsius output, and optional env overrides
• made calendar account preference updates apply immediately without restarting the server
• added focused regression tests for screen handling, debug log streaming, project discovery, weather, and calendar configuration

Why

Several user-visible paths were brittle or misleading:

• screen requests often fell back to window-title summaries because screenshots exceeded the vision upload limit or specific phrasings missed the fast screen route
• debugging background behavior in the UI required watching backend logs directly
• project resolution only scanned ~/Desktop, which broke prompts against repos stored in normal local dev directories
• weather was hardcoded to St. Petersburg, FL instead of reflecting the actual user location
• calendar account changes required a restart before taking effect

Impact

• screen descriptions are more reliable and easier to debug in real time
• JARVIS can find local projects in common developer directories without manual relocation
• weather output now follows the actual environment or an explicit override
• settings changes for calendar accounts take effect immediately

Validation

• pytest -q tests/test_calendar_access.py tests/test_debug_log_stream.py tests/test_lookup_reporting.py tests/test_project_discovery.py tests/test_screen.py tests/test_screen_detection.py tests/test_weather.py
• npm ci && npm run build