Smoke-sweep fixes: exact saves, local dates, safer remove, readable markers

- Garden and plant dialogs keep centimeters as the source of truth
  (LengthField in lib/units.ts): a no-change Save no longer rewrites
  900 cm as 899.922 or a 45 cm spacing as 44.958, bumping versions and
  writing bogus history entries on the way.
- The UI stamps every date with the browser's local day (lib/dates.ts).
  Journal notes already did; plop placement, fill and removal now do too,
  so a 9 pm placement isn't "planted tomorrow". The fill endpoint gained an
  optional plantedAt; API and agent callers still default to UTC today.
- Removing an object that holds plants asks first and says how many go
  with it. An empty one still goes straight away (one Undo restores it).
- The expanded plant card's action row wraps instead of clipping "Delete".
- Monogram lettering switches to a dark ink on pale marker colors (garlic,
  cabbage, marigold) instead of near-white on near-white.
- Copy-as-plan proposes the next free year and warns when the typed name
  already exists, so two gardens can't both read as "the 2027 plan".
- Plan cards show the base name with a "2027 plan" tag, so the year — the
  point of the name — survives truncation.
- A rejected model spec now says which model and why: a wrapped
  ErrInvalidInput's reason reaches the client as the 400's message, and the
  Settings field shows it inline instead of toasting "invalid input".

Also defuses a clock bomb in TestRemainingReturnsWhenAPlantingIsRemoved,
which only passed while the real date was before 2026-08-01.

Co-Authored-By: Claude Fable 5 <[email protected]>

web/src/components/gardens/GardenCard.tsx

@@ -5,7 +5,7 @@ import { IconButton } from '@/components/ui/Button'
 import { Tag } from '@/components/ui/Tag'
 import type { Garden } from '@/lib/gardens'
 import { useGardenFull } from '@/lib/objects'
-import { planYearOf } from '@/lib/plan'
+import { parsePlanName, planYearOf } from '@/lib/plan'
 import { sharesQueryOptions } from '@/lib/shares'
 import { formatSize } from '@/lib/units'
 import { kindPlural } from '@/editor/kinds'
@@ -15,8 +15,8 @@ import { GardenThumb } from './GardenThumb'
 const COUNTED_KINDS = ['bed', 'grow_bag', 'container', 'in_ground', 'tree', 'path', 'structure']
 
 /**
- * One garden as a card: the plot thumbnail (a link into the editor), name + an
- * optional `plan` tag, size, a counts line, who it's shared with, and a footer
+ * One garden as a card: the plot thumbnail (a link into the editor), name (a
+ * plan copy shows its base name and a `<year> plan` tag), size, a counts line, who it's shared with, and a footer
  * of Open + share / copy / edit / delete. A garden shared WITH you shows its
  * role and a leave action instead of the owner's tools.
  */
@@ -41,6 +41,9 @@ export function GardenCard({
   const full = useGardenFull(garden.id)
   const shares = useQuery({ ...sharesQueryOptions(garden.id), enabled: owner })
   const planYear = planYearOf(garden.name)
+  // A plan's year is the point of its name, and the first thing truncation
+  // would eat ("Back Yard — 20…"); show the base name and put the year on the tag.
+  const title = planYear != null ? (parsePlanName(garden.name)?.base ?? garden.name) : garden.name
 
   const meta = useMemo(() => {
     const data = full.data
@@ -79,9 +82,9 @@ export function GardenCard({
       <div className="flex flex-1 flex-col gap-2 px-[18px] py-4">
         <div className="flex items-center gap-2">
           <span className="min-w-0 truncate font-heading text-lg" title={garden.name}>
-            {garden.name}
+            {title}
           </span>
-          {planYear != null && <Tag tone="accent">plan</Tag>}
+          {planYear != null && <Tag tone="accent">{planYear} plan</Tag>}
           <span className="ml-auto flex-none text-[12.5px] font-semibold text-ink-mute">
             {formatSize(garden.widthCm, garden.heightCm, garden.unitPref)}
           </span>