TASK-024 TUI: Weather alert banner at top of Personal page

Description

When the weather payload has active alerts[] or AQI > 100, show a persistent single-line banner at the top of the Personal page (above the first row of panels).

Banner format: ⚠ Freeze Warning · until 9:00 AM · AQI 142 Unhealthy

Behavior:

• Only shown when at least one condition is active
• Styled bold red (alert) or dark orange (AQI only)
• Dismissible with x until the next data refresh re-evaluates
• Survives panel refreshes — only clears when the underlying alert is gone
• Multiple alerts: show the first + "and N more"

Implementation:

• Add a Static widget above the ContentSwitcher, initially display: none
• In refresh_data(), check weather payload for alerts and AQI; show/hide and update the widget accordingly
• Track dismissed state in a set of alert event names; compare against current alerts on refresh

Acceptance Criteria

• #1 Banner appears when alerts[] is non-empty or AQI > 100
• #2 Banner is hidden when no alert conditions are active
• #3 x dismisses the banner until next data refresh
• #4 Multiple alerts show count
• #5 Banner does not appear on News or System pages