feat(ui): add calendar date picker for inline date editing

Inline editing a date column now opens a visual calendar widget instead of
a plain text input. The calendar shows the month grid with today, selected
date, and cursor highlighted. Navigate with h/l (day), j/k (week), H/L
(month), enter to pick, esc to cancel.

- New calendarState type with cursor, selected, field pointer, and callback
- calendarGrid renders a bordered month view with Wong palette styles
  (CalCursor, CalSelected, CalToday)
- Calendar overlay composited via bubbletea-overlay, stacks with other overlays
- openDatePicker helper wires calendar confirm to form submit + reload
- All inline date edits (projects, quotes, maintenance, appliances, service
  logs) route through the calendar instead of huh.Input
- Full forms retain text inputs for dates (calendar is inline-only)
- Help overlay includes Date Picker section
- Keybindings doc updated with date picker and note preview sections
- Extracted keyEsc constant to satisfy goconst lint

Tests:
- 12 new tests: grid rendering, day/week/month movement, month boundary
  crossing, daysIn, sameDay, key navigation, confirm writes date, esc
  cancels, renders in view, month nav, empty value defaults to today

[DATEPICKER]

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: cpcloud

AGENTS.md

@@ -1029,3 +1029,15 @@ in case things crash or otherwise go haywire, be diligent about this.
 ## Questions
 - Why are some values pointers to numbers instead of just the number? E.g.,
   HOAFeeCents and PropertyTaxCents. Why aren't those just plain int64s?
+
+## Moar
+- for the calendar widget, let's make ctrl+shift+h/l moves years
+- let's make sure that deleting, even soft deleting doesn't break the model,
+  e.g., if i try to delete a quote that's linked to a project, i get
+  a reasonable error message, probably in the status bar but open to thoughts
+  on where to show it
+- would be nice to have a way to hide completed projects easily. we'll get to
+  the generic way to do that when we implement filter, but i think it will
+  still be useful as a standalone feature
+- seems like vendors should have a drilldown link to quotes, that would effectively show the quote history for a vendor
+- so for the house brick animation on the main website, the reanimation of hte fallen bricks kind of snaps back into place at the last step

docs/content/reference/keybindings.md

@@ -52,7 +52,7 @@ Complete reference of every keybinding in micasa, organized by mode.
 
 | Key     | Action |
 |---------|--------|
-| `enter` | Drilldown into detail view, or follow FK link |
+| `enter` | Drilldown into detail view, follow FK link, or preview notes |
 | `i`     | Enter Edit mode |
 | `?`     | Open help overlay |
 | `q`     | Quit (exit code 0) |
@@ -75,7 +75,7 @@ Same as Normal mode, except `d` and `u` are rebound:
 | Key   | Action |
 |-------|--------|
 | `a`   | Add new entry to current tab |
-| `e`   | Edit current cell inline, or full form if cell is read-only |
+| `e`   | Edit current cell inline (date columns open calendar picker), or full form if cell is read-only |
 | `d`   | Toggle delete/restore on selected row |
 | `x`   | Toggle visibility of soft-deleted rows |
 | `p`   | Edit house profile |
@@ -107,6 +107,24 @@ When the dashboard overlay is open:
 | `?`       | Open help overlay (stacks on dashboard) |
 | `q`       | Quit |
 
+## Date picker
+
+When inline editing a date column, a calendar widget opens instead of a text
+input:
+
+| Key       | Action |
+|-----------|--------|
+| `h`/`l`   | Move one day left/right |
+| `j`/`k`   | Move one week down/up |
+| `H`/`L`   | Move one month back/forward |
+| `enter`   | Pick the highlighted date |
+| `esc`     | Cancel (keep original value) |
+
+## Note preview
+
+Press `enter` on a notes column (e.g., service log Notes) to open a read-only
+overlay showing the full text. Any key dismisses it.
+
 ## Help overlay
 
 | Key       | Action |

internal/app/calendar.go

@@ -0,0 +1,112 @@
+// Copyright 2026 Phillip Cloud
+// Licensed under the Apache License, Version 2.0
+
+package app
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/charmbracelet/lipgloss"
+)
+
+// calendarState tracks the date picker overlay.
+type calendarState struct {
+	Cursor    time.Time // the date the cursor is on
+	Selected  time.Time // the date the field currently has (dim highlight)
+	HasValue  bool      // whether Selected is meaningful
+	FieldPtr  *string   // pointer to the form field's value string
+	OnConfirm func()    // called after writing the picked date to FieldPtr
+}
+
+// calendarGrid renders a single month calendar with the cursor highlighted.
+func calendarGrid(cal calendarState, styles Styles) string {
+	cursor := cal.Cursor
+	year, month := cursor.Year(), cursor.Month()
+
+	// Header: month name + year.
+	header := lipgloss.NewStyle().
+		Bold(true).
+		Foreground(accent).
+		Render(fmt.Sprintf(" %s %d ", month.String(), year))
+
+	// Day-of-week labels.
+	dayLabels := lipgloss.NewStyle().
+		Foreground(textDim).
+		Render("Su Mo Tu We Th Fr Sa")
+
+	// Build the day grid.
+	first := time.Date(year, month, 1, 0, 0, 0, 0, time.Local)
+	startDow := int(first.Weekday()) // 0=Sun
+	daysInMonth := daysIn(year, month)
+
+	var grid strings.Builder
+	// Leading blanks.
+	for i := 0; i < startDow; i++ {
+		grid.WriteString("   ")
+	}
+
+	for day := 1; day <= daysInMonth; day++ {
+		date := time.Date(year, month, day, 0, 0, 0, 0, time.Local)
+		label := fmt.Sprintf("%2d", day)
+
+		isCursor := sameDay(date, cursor)
+		isSelected := cal.HasValue && sameDay(date, cal.Selected)
+		isToday := sameDay(date, time.Now())
+
+		var style lipgloss.Style
+		switch {
+		case isCursor:
+			style = styles.CalCursor
+		case isSelected:
+			style = styles.CalSelected
+		case isToday:
+			style = styles.CalToday
+		default:
+			style = lipgloss.NewStyle()
+		}
+
+		grid.WriteString(style.Render(label))
+
+		dow := (startDow + day - 1) % 7
+		if dow == 6 && day < daysInMonth {
+			grid.WriteString("\n")
+		} else if day < daysInMonth {
+			grid.WriteString(" ")
+		}
+	}
+
+	// Navigation hints.
+	hints := lipgloss.NewStyle().
+		Foreground(textDim).
+		Render("h/l day  j/k week  H/L month  enter pick  esc cancel")
+
+	return lipgloss.JoinVertical(
+		lipgloss.Left,
+		header,
+		"",
+		dayLabels,
+		grid.String(),
+		"",
+		hints,
+	)
+}
+
+func daysIn(year int, month time.Month) int {
+	return time.Date(year, month+1, 0, 0, 0, 0, 0, time.UTC).Day()
+}
+
+func sameDay(a, b time.Time) bool {
+	return a.Year() == b.Year() && a.Month() == b.Month() && a.Day() == b.Day()
+}
+
+// calendarMove adjusts the calendar cursor by the given number of days.
+func calendarMove(cal *calendarState, days int) {
+	cal.Cursor = cal.Cursor.AddDate(0, 0, days)
+}
+
+// calendarMoveMonth adjusts the calendar cursor by the given number of months.
+func calendarMoveMonth(cal *calendarState, months int) {
+	cal.Cursor = cal.Cursor.AddDate(0, months, 0)
+}