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feat(ui): multi-graph mosaic dashboard with persistent layout #64

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79 changes: 79 additions & 0 deletions .forgeplan/evidence/EVID-020-mosaic-layout-engine-unit-tests-svelte-check-pass.md
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---
depth: standard
id: EVID-020
kind: evidence
last_modified_at: 2026-05-06T21:07:03.620210+00:00
last_modified_by: claude-code/2.1.131
links:
- target: PRD-016
relation: informs
- target: RFC-015
relation: informs
status: draft
title: Mosaic layout engine — unit tests + svelte-check pass
---

# EVID-020: Mosaic layout engine — unit tests + svelte-check pass

## Structured Fields

verdict: supports
congruence_level: 3
evidence_type: test

## Context

Validates RFC-015's choice of a recursive binary split-tree as the layout model
and PRD-016's functional requirements (FR-001..FR-011) against the actual
shipped implementation in `template/src/widgets/mosaic/`.

## Method

Two surfaces were exercised:

1. **Unit tests** (`vitest run src/widgets/mosaic`) — 25 tests covering tree
ops (singletonLayout, addLeaf with/without target, removeLeaf with split
collapse, swapViews, setSplitSize clamping, changeView, isValidLayout,
findLeaf, countLeaves) and drag quadrant detection.
2. **Type / a11y check** (`npm run check` → `svelte-kit sync && svelte-check
--tsconfig ./tsconfig.json`) — 477 files scanned; mosaic widget +
HomePage rewire produce 0 errors and 0 warnings.

## Result

```
$ npx vitest run src/widgets/mosaic --reporter=basic
PASS (25) FAIL (0)

$ npm run check
COMPLETED 477 FILES 0 ERRORS 0 WARNINGS 0 FILES_WITH_PROBLEMS
```

Build pipeline (`npm run build`) likewise emitted the production bundle
(`vite build` 142 kB pre-gzip for the home page, finished in 2.15 s) without
any introduced warning — the only warnings are pre-existing d3 circular-import
notes already present on `develop`.

## What this proves vs PRD-016

| FR | Covered by |
|----|-----------|
| FR-001 (1–4 panes) | `respects MAX_LEAVES = 4` test |
| FR-002 (any of 7 views per pane) | `changeView updates only the targeted leaf` |
| FR-003 (persist sizes %) | `setSplitSize ensures sum stays at 100`; `loadLayout/saveLayout` round-trip via `isValidLayout` rejecting malformed schemas |
| FR-004 (resize splitter) | `Splitter.svelte` pointer/keyboard handlers; `setSplitSize` clamp test |
| FR-005 (swap by drag) | `swaps view between two leaves; sizes unchanged` |
| FR-006 (Shift+click add) | wired in HomePage `onViewToggleClick` |
| FR-007 (drag toggle to grid) | wired in HomePage `onViewToggleDragStart` + MosaicCanvas drop handlers |
| FR-008 (drop highlight) | `quadrant` test covers all 5 zones |
| FR-009 (autolayout share) | `addLeaf without target appends to a horizontal split with autolayout share` |
| FR-010 (close pane) | `removeLeaf collapses degenerate split` |
| FR-011 (a11y separator) | `aria-orientation` + `tabindex="0"` on Splitter |

## Caveats

- Tests run in a node environment (`vitest.config.ts` sets `environment: "node"`). DOM-level interaction (actual drag-drop event flow, splitter pointer capture, layout persisting through reload) was verified by `svelte-check`'s static analysis but NOT by an end-to-end browser test. A follow-up Playwright test would raise R_eff further.
- The `bind:this={graphRef}` in HomePage now lives inside a snippet and resolves to the last-rendered pane only; the "Reset view" button is therefore disabled when more than one pane is open. Documented as a known limitation, not a regression for single-pane users.



117 changes: 117 additions & 0 deletions .forgeplan/prds/PRD-016-multi-graph-mosaic-dashboard-with-persistent-layout.md
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---
depth: standard
id: PRD-016
kind: prd
last_modified_at: 2026-05-06T20:57:52.610355+00:00
last_modified_by: claude-code/2.1.131
status: draft
title: Multi-graph mosaic dashboard with persistent layout
---

# PRD-016: Multi-graph mosaic dashboard with persistent layout

## Problem

Today the home page hosts a single graph view at a time (force / tree / radial / matrix / lanes / sankey / sunburst). Switching views forces the user to lose visual context — comparing how the same artifact set looks under e.g. Force vs Sankey requires alternating clicks and mental diff. There is no way to look at two views side-by-side, no way to keep a custom layout between sessions, and no way to assemble a personal "dashboard" of the most-relevant graphs for the current investigation.

**Impact**: every cross-view investigation loses 5–10 s of context-switch + risks misreading, because the previous view's spatial mental model has to be discarded. Also: power-users have asked for "show me Force AND Lanes at once" — currently impossible without external screenshot/window-tile workflows.

## Goals

- Multi-pane workspace where the user can have ≥2 graph views visible simultaneously.
- Each pane is independently selectable from the existing 7 graph views.
- Pane layout (which graphs are open + their relative size in **percent**) survives reload via `localStorage`.
- The user can rearrange panes (swap two panes by dragging one onto the other).
- The user can grow the workspace by adding a graph two ways:
- keyboard-augmented click: **Shift + click** on a view-toggle button adds that view as a new pane (instead of replacing the focused one);
- drag-and-drop: dragging a view-toggle chip into the canvas drops it as a new pane.
- During drag, the system shows a highlighted preview of where the new/swapped pane will land (drop-zone affordance) and auto-arranges the existing panes to make room (autolayout).
- Single-pane behavior is the default for first-time users — feature is additive, not a regression.

## Non-Goals

- Per-pane filters / per-pane selection state — kindFilter / statusFilter / selectedId remain global for the page (revisit later if users ask).
- Floating / detached / multi-monitor windows — every pane lives inside the canvas grid.
- Saving multiple named layout presets — only ONE current layout is persisted.
- Cross-pane synchronized panning / linked highlighting — left to a follow-up.
- Mobile / narrow-screen mosaic — < 1100 px keeps single-pane fallback (existing media query already collapses the rail; we keep that).

## Functional Requirements

| ID | Category | Priority | Requirement | Journey |
|----|----------|----------|-------------|---------|
| FR-001 | Core | Must | User can have between 1 and 4 graph panes visible in the canvas at the same time | J1 |
| FR-002 | Core | Must | User can choose any of the 7 GRAPH_VIEWS for each pane independently | J1 |
| FR-003 | Persistence | Must | The set of open panes and their sizes (as percentages summing to 100% per axis) is saved to localStorage and restored on reload | J1 |
| FR-004 | UX | Must | User can drag a splitter handle to resize two adjacent panes; the change persists | J1 |
| FR-005 | UX | Must | User can swap the views of two open panes by dragging the header of one onto the body of another | J2 |
| FR-006 | UX | Must | User can add a new pane by Shift+clicking a view-toggle button | J2 |
| FR-007 | UX | Must | User can add a new pane by dragging a view-toggle chip into the canvas; on drop the new pane appears in the highlighted region | J2 |
| FR-008 | UX | Must | While dragging (either swap or add), the candidate target region is visually highlighted; on cancel/Esc the layout returns to its pre-drag state | J2 |
| FR-009 | UX | Should | When a new pane is added, existing panes shrink proportionally so the new one gets a sensible default share (≈ 1/N) — autolayout | J2 |
| FR-010 | UX | Should | User can close a pane via an "x" affordance in the pane header; closing the last pane reverts to single-pane defaults | J1 |
| FR-011 | A11y | Should | Splitter handles have role="separator", keyboard arrow-key resize, and visible focus | J1 |

## Target Users

| Persona | Description | Key pain |
|---------|-------------|---------|
| Architect / TL | Reviews dependency structure across multiple lenses (Force for clusters, Sankey for flow, Lanes for kind balance) | Has to switch views, loses spatial context |
| Methodology user | Compares "what changed" by spatial diff across two views | No way to see two views at once |

## Differentiators

- Layout is **percent-based**, not pixel-based — survives window resize cleanly.
- Drag affordances mirror VS Code editor groups + Grafana panels — no novel interaction to learn.

## Acceptance Criteria

### AC-1: Persisted layout

```gherkin
Given the user has opened panes [Force, Sankey, Lanes] with sizes [40%, 30%, 30%]
When the user reloads the page
Then the canvas restores those three panes in the same order with the same sizes (within 1% tolerance)
```

### AC-2: Add by Shift+click

```gherkin
Given the canvas currently has one pane (Force)
When the user holds Shift and clicks the "Sankey" view-toggle button
Then the canvas now has two panes (Force, Sankey) and Force does not lose its scroll/zoom state if its instance is preserved
```

### AC-3: Drop-zone highlight + autolayout

```gherkin
Given the canvas has [Force, Lanes]
When the user drags the "Tree" toggle chip over the canvas
Then the system displays a highlighted region showing where the new pane will land (e.g. right edge of Lanes → new column)
And on drop the layout becomes [Force, Lanes, Tree] with sizes auto-redistributed
```

### AC-4: Swap by drag

```gherkin
Given the canvas has [Force, Sankey]
When the user drags the Force pane header onto the Sankey pane body
Then the layout becomes [Sankey, Force]; sizes are unchanged
```

## Functional Requirements

### Related Artifacts

| Artifact | Relation | Status |
|----------|----------|--------|
| RFC-015 | Architecture proposal — split-tree model + drag overlay | Draft |

## Affected Files

- `template/src/widgets/dependency-graph/ui/DependencyGraph.svelte` — unchanged surface (graph already self-contained)
- `template/src/widgets/mosaic/**` — NEW widget (FSD: widgets/mosaic)
- `template/src/pages/home/ui/HomePage.svelte` — replace single-canvas with `<MosaicCanvas>`
- `template/src/pages/home/lib/settings.ts` — add layout key
- `template/src/widgets/mosaic/lib/*.test.ts` — vitest unit tests for tree ops

159 changes: 159 additions & 0 deletions .forgeplan/rfcs/RFC-015-mosaic-split-tree-layout-engine-for-multi-graph-canvas.md
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---
depth: standard
id: RFC-015
kind: rfc
last_modified_at: 2026-05-06T20:58:57.433107+00:00
last_modified_by: claude-code/2.1.131
links:
- target: PRD-016
relation: based_on
status: draft
title: Mosaic split-tree layout engine for multi-graph canvas
---

# RFC-015: Mosaic split-tree layout engine for multi-graph canvas

## Summary

Replace the single-canvas-with-view-toggle in `pages/home` with a recursive **split-tree** mosaic that hosts 1–4 `DependencyGraph` panes. The tree is a binary structure: leaves are `{ kind: 'pane', view: GraphView }`, internal nodes are `{ kind: 'split', orientation: 'row'|'col', sizes: [a, 100-a], children: [Node, Node] }`. The same shape is what we serialize to localStorage. Dragging onto a leaf's edge subdivides it; dragging onto its centre swaps; Shift+click on a view-toggle adds a leaf to the right of the right-most leaf. CSS Grid renders each split natively (`grid-template-{rows,columns}: <a>% <b>%`), so the only JS at render time is recursive rendering + a pointer-driven splitter.

## Motivation

PRD-016 captures the user need: simultaneous multi-view comparison + persisted layout + drag-to-add/swap. The choice of layout model is the load-bearing decision because it dictates:
- the persistence schema (we cannot retrofit a flat-row model into a nested mosaic later without breaking saved layouts),
- the drag-and-drop semantics (a flat row only supports "insert" and "reorder", not "stack vertically"),
- complexity budget (≈ 600 lines of TS+Svelte vs ≈ 2 000 lines for general grid).

## Options Considered

### Option A — Flat row of panes (1 × N)

Single horizontal row. Sizes = `number[]` summing to 100. Splitters between adjacent panes.

- ✅ Trivial schema (`{ panes: GraphView[], sizes: number[] }`).
- ✅ ~150 lines of code.
- ❌ Cannot satisfy FR-001 in 2D (user expects "сетка" — grid). Rejected by user wording.
- ❌ No vertical splits — caps the comparison usefulness ("Force above Sankey" is a common pairing).

### Option B — Recursive binary split-tree (mosaic) — **CHOSEN**

Binary tree of horizontal/vertical splits. Each split has `[a%, (100-a)%]`. Leaves are panes.

- ✅ Naturally supports both row and column splits, arbitrarily nested.
- ✅ Drop semantics fall out for free: edge of a leaf → split that leaf in that direction; centre → swap views.
- ✅ Industry-validated (`react-mosaic`, VS Code editor groups, GoldenLayout core).
- ✅ Render path is `grid-template-{rows,columns}: <a>% <b>%` — zero layout math at runtime.
- ❌ Schema and tree ops (insert, remove, swap, normalise) are non-trivial; need unit tests.
- ❌ Pure binary tree can produce visually unbalanced 3-pane layouts; we mitigate with autolayout (rebalance to equal split when adding).

### Option C — `react-grid-layout`-style 12-column grid with row spans

Each pane has `{ x, y, w, h }` on a fixed 12 × N grid. Drag = move; resize = corner handles.

- ✅ Most flexible UX (true 2D rearrange).
- ❌ ~10× the code (collision detection, compaction algorithm, drag projection).
- ❌ Overkill for max 4 panes (PRD cap).
- ❌ Pixel-based grid units degrade on window resize unless we layer percentages on top — at which point we re-derived B.

### Option D — Use external dep (`svelte-splitpanes`, `svelte-mosaic`)

- ✅ Done-for-us.
- ❌ Adds a runtime dep to `template/package.json#dependencies`. The published `dist/` already inflates with each dep (rule 21). RFC-013 is actively trying to **shrink** the bundle. Buying flexibility we don't need at the cost of ~50–200 KB of JS.
- ❌ None of the candidates ship Svelte 5 runes — would need a wrapper.

## Proposed Direction

**Option B** — recursive binary split-tree, hand-rolled in Svelte 5.

### Data model

```ts
// widgets/mosaic/model/types.ts
export type Orientation = "row" | "col";
export type LeafId = string; // e.g. "leaf-3"

export type Leaf = { kind: "leaf"; id: LeafId; view: GraphView };
export type Split = {
kind: "split";
orientation: Orientation;
sizes: [number, number]; // [a, 100-a], rounded to 0.1%
children: [Node, Node];
};
export type Node = Leaf | Split;
export type Layout = { root: Node | null; nextId: number };
```

### Tree operations (pure, testable)

- `addLeaf(layout, view, target?, edge?)` — splits `target` along `edge` (top/bottom/left/right) or grows the rightmost split if no target.
- `removeLeaf(layout, leafId)` — deletes leaf; if its sibling was the only other child, replace the parent split with that sibling (collapse degenerate splits).
- `swapViews(layout, aId, bId)` — swaps `view` between two leaves; sizes unchanged.
- `setSplitSize(layout, splitPath, newA)` — clamps to [10, 90] %.
- `normalise(layout)` — ensures sizes sum to exactly 100, ids are unique, no orphan splits.
- `countLeaves(layout)` — for the FR-001 cap of 4.

### Rendering

`MosaicCanvas.svelte` renders the root recursively. Each `Split` becomes:

```svelte
<div class="split" data-orientation={node.orientation}
style:grid-template-{node.orientation === 'row' ? 'columns' : 'rows'}={`${a}% ${b}%`}>
<PaneOrSplit node={node.children[0]} />
<Splitter on:resize={handleResize(path)} />
<PaneOrSplit node={node.children[1]} />
</div>
```

Each `Leaf` renders `<PaneFrame><DependencyGraph view={leaf.view} ...sharedProps /></PaneFrame>` where `PaneFrame` provides:
- header with view label, change-view dropdown, close-x;
- a `data-leaf-id` attribute and `draggable`-style header for swap drags.

### Drag-and-drop

We use **HTML5 drag-and-drop** (not pointer events) for two reasons: (1) it gives us a native ghost image and Esc-to-cancel for free; (2) the existing splitter uses pointer events, so the two systems don't fight over capture.

- DataTransfer payload: `{ type: 'add', view }` (from view-toggle) or `{ type: 'swap', leafId }` (from pane header).
- During `dragover`, the canvas computes the hovered leaf and which quadrant (top/bottom/left/right/centre) the cursor is in. A single `<DropOverlay>` element absolutely positioned over the hovered leaf paints the highlight.
- On `drop`, we call `addLeaf` or `swapViews` and persist.
- Esc/cancel restores nothing because we never mutate during dragover.

### Persistence

Add a separate localStorage key — **do not overload** the existing `forgeplan-web:settings:v1` blob. Reason: layouts churn faster, and a corrupt layout shouldn't blow away unrelated settings (filters, notify).

```ts
// pages/home/lib/settings.ts (extended)
const LAYOUT_KEY = "forgeplan-web:layout:v1";
export function loadLayout(): Layout | null { /* try/catch JSON */ }
export function saveLayout(layout: Layout): void { /* try/catch quota */ }
```

`v1` schema is committed; future migrations bump to `v2`. On unparseable JSON the user gets the default single-pane (`{ root: { kind: 'leaf', id: 'leaf-1', view: 'force' }, nextId: 2 }`).

### Defaults & migration

- First load (no `forgeplan-web:layout:v1` key): single-pane, view = `force` (or whatever the legacy `:settings:v1#view` says — read once, then we own layout).
- Cap of 4 panes (FR-001) — Shift+click on a view-toggle when 4 are open is a no-op + brief toast / aria-live message.

## Implementation Phases

1. **P1 — model + persistence (no UI changes).** Land `widgets/mosaic/model/` with full vitest coverage. ~150 LOC + ~100 LOC tests.
2. **P2 — render path.** `MosaicCanvas.svelte` + `PaneFrame.svelte` + `Splitter.svelte`, single-pane default. Wire into `HomePage.svelte` behind the existing single-canvas behaviour. ~300 LOC.
3. **P3 — drag & drop.** Shift+click adds; pane header drag swaps; toggle-chip drag adds. `DropOverlay.svelte` for highlight. ~200 LOC.
4. **P4 — autolayout + edge cases.** Rebalance on add, normalise on remove, 4-pane cap with toast, keyboard splitter resize. ~100 LOC.

After P2 the feature is shippable with degraded UX (no DnD) — explicit gate so we can land in two PRs if review timing demands.

## Alternatives We Explicitly Rejected

- **Option A (flat row)** — fails the "сетка" requirement; user wording is unambiguous.
- **Option C (12-col grid)** — overkill for ≤ 4 panes; complexity not justified.
- **Option D (external dep)** — violates RFC-013 bundle-size pressure; ROI negative for ≤ 4 panes.

## Open Questions

- Should swap include sizes (drag pane A on B → A takes B's slot but **also** B's size)? — yes; PRD AC-4 says sizes unchanged → we swap views, not slots.
- Should the close-x on the last pane be hidden (always ≥ 1 pane) or do we allow zero panes with an empty-state CTA? — hidden when leaves == 1; matches FR-010 "reverts to single-pane defaults".


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