Untangle the day log: focused logging, period switch, plain headers, start-date fix

[mapgie]

What this fixes

Five confusions on the unified day screen, one of which turned out to be a data bug, plus the ways logs could not be deleted and the day sheet's display faults.

1. Speed dial / widget opened the whole day. Opening the screen for one category (speed dial, quick-log widget, or an entry from the day sheet) now shows only that category as the hero, with a "Log more for this day" button that expands to the full day. The focus follows a re-file and survives a day switch. Untouched categories are never saved, so the focused save writes only what was entered.

2. "Period started today" looked like a menu row but was a toggle. It is now a SwitchRow inside the card. It stays in place while the start is pending (switching it off is the undo), and its subtitle says what saving will do: start a new period, continue one, or move a period's start back to this day. Once the day is a stored period day the filled status row with End/Undo is unchanged.

3. The Day section duplicated the title. Removed. Tapping the screen title opens the date picker directly. The title's "Switch day or category" sheet is gone; its category "jump" only expanded a grouped row and had no other effect.

4. Metric headers looked collapsible but opened the re-file sheet. They are plain SectionHeaders now, consistent with Symptoms and the group cards. Re-filing lives in a "Move to another category" text button next to "Add note", shown once a value has been entered.

5. Logging a period day just before a period's start silently did nothing. The save called logPeriodDay(day), which moves the start back, then updateEpisode(start = loadedStart), which trimmed the day again. The save now passes the earlier of the loaded start and the day, and the switch moves the displayed start so the screen shows what the save will produce. A PeriodRepositoryTest case covers the sequence; LESSONS.md records the pattern.

6. Deleted entries came back. On a period day, every save fanned out to each "Log with period" category whether or not it was touched, writing a slider's minimum or a count of 0. Pinned categories now follow the same touched-only rule as every other entry.

7. Allow-multiple entries had no delete on the day screen. The day screen now lists the day's stored entries under the input, each with Edit (loads it into the input in place) and Delete. The header reads "N logged" when the input is empty but entries exist.

8. Flow could never be deleted. "Remove this day from period" now removes the day's flow entry with the day. Symptoms and tracked categories are kept, and the dialog copy says so.

9. The calendar day sheet could not delete anything, and its display was broken.

• Every row now has a "delete" action with a confirmation dialog. A row with several entries of one category deletes them all; timed entries have a per-entry "delete". This is the one place every stored log is listed, so it covers Flow and Symptoms on any day, including a Flow log stranded on a day that is no longer a period day.
• Flow and Symptoms sit inside the period box on a period day (flow first) instead of under "Tracked".
• Rows used the category's raw colour token, so a category inheriting its group's colour rendered a neutral bubble with near-invisible value text ("No", "Yes"). The sheet now resolves the effective token through the groups (DayLogData carries them), and a category with no colour at all shows its value in the normal text colour.

Changes

• LogScreen.kt: focus-mode branch, footer switch, plain headers, re-file button, RefileSheet replaces DaySwitchSheet, DaySection removed, stored-entries list for allow-multiple categories
• LogViewModel.kt: focusedCategoryId, loadedEpisodeStart, dayLogs state; showFullDay(), start-moving startPeriodToday()/undoStartPeriod(), minOf start in save(), touched gate on the pinned fan-out, deleteDayLog()/editDayLog(), flow removal in removeDay()
• DayLogSheet.kt, HomeViewModel.kt, HomeScreen.kt: per-row delete with confirmation, period grouping of system categories, group-aware colours
• PeriodRepositoryTest.kt: regression test for the absorb-then-edit sequence
• changelog/unreleased/logging-ui-confusions.json (minor), LESSONS.md, handover doc bullets

a11y_check.py passes.

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https://claude.ai/code/session_01ELZpYZSRB1DMaJiXvkcVSD