Release 0.3.1

[ClaudiuSchuster]

Summary

• add exact rolling 24-hour consumption to every 5-hour quota history, keep measured weekly activity authoritative, and supplement rounded-zero Spark history with clearly marked minimum-height estimates
• remove the internal collection-start diagnostic and add refresh-driven reset plus configurable 5-hour and 7-day low-limit notifications
• refresh the complete release screenshot set, including the optional four-ring Codex quota state, full-hour bucket tooltip, focused vertical panel, and balanced social preview

Validation

• make verify
• Super-Linter 8.7.0 with all configured validators
• normal user installation, targeted applet reload, and byte-for-byte 10-file deployment audit
• live Cinnamon 6.6.9 validation with the production applet state restored

Closes #19
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