Add summary strip, persistent dark mode, and UI polish (bump to 0.3.0)

[vantough]

Motivation

• Provide a compact summary of totals and counts on the main dashboard for quicker visibility.
• Improve dark-mode behavior by persisting the setting and making the toggle icon and control more robust.
• Polishing typography, floating control styling, and accessibility/responsiveness to make the UI feel more modern and consistent.

Description

• Bumped project VERSION to 0.3.0 and added the Inter webfont via index.html with preconnect optimizations.
• Added a new summary strip UI block (.summary-strip / .summary-item) to index.html and CSS, and wired DOM elements to display Total Expense, Expense Count, and Payment Count.
• Refactored js/darkMode.js to persist dark-mode in localStorage, provide renderDarkModeIcon() and applyDarkModeState() helpers, and guard against missing DOM nodes.
• Enhanced CSS (css/styles.css) with improved toggle button styling, animations, dark-mode variants, icon hover behavior, and typography inheritance changes.
• Extended js/logic.js with updateSummaryStrip() and added calls to keep the summary in sync from expense/payment lifecycle hooks and on DOMContentLoaded, plus small DOM-safety fixes in remaining/percentage update helpers.
• Exported updateSummaryStrip on window and updated tasks/lessons.md with new lessons learned regarding UI and theme parity.

Testing

• No automated tests were added or executed as part of this change.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
expense-splitter	Ready	Preview, Comment	Apr 4, 2026 8:43pm

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