Plants mode: recent-planted quick strip + clump/rows fill (#100)

Two things Steve asked for, both in the #99 Plants mode:

- A "Recent" strip of the plants most recently planted IN THIS GARDEN
  (recentlyPlantedIds — derived from actual plantings, newest first, unique;
  NOT the manual localStorage tray), as tap-to-arm chips. So re-planting
  "more of the same" is one tap, no picker. Hidden until something's planted.
- A clump/rows fill control (FillControl), shown once a plant is armed:
  pick a layout, "Fill bed", and it runs POST /objects/:id/fill region=all
  with the chosen layout — the #77 grid/clump fill the UI could NOT reach
  before (it was agent/REST only). Defaults to rows (a real planting).
  useFillObject mirrors useClearObject: one request, invalidate /full.

Both live in the shared PlantPlacementTools, so desktop's focus toolbar and
the mobile Plants strip get them identically. Fill is capped/validated
server-side (#95) and covered spots are skipped, so re-filling is safe.

Verified live at 390px: the Recent strip shows this garden's tomato/lettuce/
garlic; arming a chip reveals Clump|Rows + Fill bed; fill fires cleanly.
tsc + vitest (95, incl. recentlyPlantedIds) + build green. DESIGN updated.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01H3zbym8Doka2d7D48maSgZ

DESIGN.md

@@ -129,7 +129,7 @@ React 19 + TypeScript + Vite + Tailwind 4 (`@tailwindcss/vite`), `@tanstack/reac
 
 - **Routes:** `/login`, `/register`, `/gardens` (list), `/gardens/:id` (editor, `?focus=objectId`), `/plants` (catalog). Auth guard on the router root via `/auth/me`.
 - **State:** TanStack Query for all server state (editor keyed on `gardens/:id/full`; optimistic mutations with version-conflict rollback). One small Zustand store for ephemeral editor state only: viewport, selection, focused object, active tool, in-flight drag, and the mobile `mode`.
-- **Mobile-first editor: one primary mode (#99).** On a phone the canvas is the whole screen; a bottom mode bar switches which tools dock beneath it — **Fixtures** (the object palette), **Plants** (the seed tray, shown once a bed is focused; focusing a bed puts you in this mode), **Journal**, **Assistant** (the last two open the rail sheet; Assistant is hidden with no model). This replaces the old phone layout where a stacked control column shoved the garden into a corner. Desktop keeps its side-column layout (the mode bar is `md:hidden`) and treats `mode` as an inert hint. History stays reachable as a rail sub-tab rather than a fifth primary mode.
+- **Mobile-first editor: one primary mode (#99).** On a phone the canvas is the whole screen; a bottom mode bar switches which tools dock beneath it — **Fixtures** (the object palette), **Plants** (shown once a bed is focused; focusing a bed puts you in this mode — a "Recent" strip of what you've most recently planted *in this garden* (#100, derived from plantings, not the manual tray) for one-tap re-arming, the seed tray, the picker, and a clump/rows **fill** control that runs the region fill (#77) the UI couldn't reach before), **Journal**, **Assistant** (the last two open the rail sheet; Assistant is hidden with no model). This replaces the old phone layout where a stacked control column shoved the garden into a corner. Desktop keeps its side-column layout (the mode bar is `md:hidden`) and treats `mode` as an inert hint. History stays reachable as a rail sub-tab rather than a fifth primary mode.
 - **Editor components (`web/src/editor/`):** `GardenCanvas` (svg root + viewport g), `useViewport` (use-gesture pan/zoom/pinch), `ObjectShape`, `PlopMarker` (semantic-zoom branching), `Palette` (drag-to-place object kinds), `EditorRail` (the one side panel), `Inspector`, `HistoryPanel`, `PlantPicker`.
 - **One rail, tabs inside it.** The inspector, history, journal and assistant all want the same strip of screen; rather than each bolting on its own chrome they are tabs in `EditorRail` — so the canvas is one width instead of a different width per panel, and adding a panel is adding a tab. Selecting an object switches to the Inspector tab automatically, so the rail is never something you operate before you can edit; on a phone the same tabs render in the bottom sheet the inspector already used. Pure geometry helpers (local↔world transforms, unit formatting) in `web/src/lib/geometry.ts`, unit-tested.