fix: auth/due-next, sign-in trigger, toolbar sign-in, editor sync, mobile wrapping

[onlyonehas]

Changes

Bug fixes

• Due Next total — computeSummary skips commented lines (info.isCommented)
• Sign-out state — input/output/deductionDates reset on logout (both useCalculations and index.tsx)
• Quill editor sync — uses requestAnimationFrame retry so initialInput shows on page load (was blank before)
• Sign-in button — triggers Google sign-in directly instead of opening the sign-out modal
• Mobile wrapping — .ql-editor now has white-space: pre + overflow-x: auto to prevent line wrapping

UI polish

• Sign-up prompt — replaced blue banner with a CloudOff toolbar button matching save/clear style, tooltip on hover
• Heading edit — single-click to rename (was double-click), shows "rename" label on hover
• Calendar icons — always visible at opacity-40 instead of opacity-0, so users see the feature
• Toggle wording — "Remaining" → "This Period", "Due Next" → "Upcoming"
• Analytics — Firebase Analytics init + page_view events on route changes

[github-actions]

Visit the preview URL for this PR (updated for commit 259d905):

https://instant-calc--pr54-fix-auth-due-analyti-xqqqyy7k.web.app

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