docs: audit pass — fix wrong shortcut + behaviour claims

Swept the help pages against the actual code paths and removed /
corrected claims that didn't ship.

vector-tools.md
- Removed: spacebar temp-pan, Alt duplicate-as-you-drag, generic
  Shift-constrain.
- Added: verified shortcuts (Cmd+Z/Y/D/C/X/V/G, Cmd+]/[ with
  Shift modifier, Cmd+J / Cmd+Alt+J in Pen edit mode,
  Delete/Backspace for layers + anchors).

tool-select.md
- Removed Cmd+A (not wired), Alt-drag-duplicate (not wired),
  Shift-constrain-axis drag (not wired), Cmd-click stack-walk
  (not wired). Kept the verified marquee + multi-select.

tool-direct-select.md
- Re-wrote anchor / handle interactions to match the actual hit-
  test branches (Alt-click anchor toggles kind in one click; Alt-
  drag a handle breaks symmetry; Alt-click segment inserts an
  anchor; plain drag of a segment bows it). Removed the "click an
  endpoint to continue drawing" claim — that's a Pen-only flow.

tool-hand.md
- Removed every fictional zoom shortcut (Cmd+wheel, Cmd+0,
  Cmd+= / Cmd+-). Documented the real zoom controls (−/+/Fit
  buttons + dropdown in the canvas toolbar). Spacebar reposition
  scoped correctly to the Pen tool only.

tool-pen.md
- Clarified that the Pen options pane has its own Fill / Stroke
  inputs (separate from any "Stroke panel" that doesn't actually
  exist).

tool-pencil.md
- Removed every claim that wasn't true: smoothing slider, Alt-drag
  append, auto-close. Pencil writes a plain polyline (M…L L L…),
  one layer per stroke. Tool options pane has only colour + width.

tool-shape.md
- Filled in the missing primitives (rounded-rect / circle /
  triangle — total 8, not 5). Removed Shift / Alt drag modifiers
  that aren't checked in startShapeDrag / commitShapeFromDrag.
  Added the small-drag → default-size fallback that the code does
  do.

tool-text.md
- Replaced the "drag a rectangle to size" claim with the actual
  click-to-place behaviour (placeTextWithTool drops a fixed-size
  box at the cursor + auto-flips to Select with the box focused).
  Softened the Cmd+B/I/U claims to "browser native rich-text
  shortcuts" since they're not wired in the app code.

tool-eyedropper.md
- Replaced the fictional "inline ⊙ buttons next to colour fields"
  with the real OS-colour-picker eyedropper that Chrome's native
  <input type="color"> shows.

panel-layers.md
- Removed Cmd+A select-all (not wired). Added Shift modifier to
  Cmd+]/[ for bring-to-front / send-to-back. Clarified that
  position units are inches in print modes, pixels in Custom Art
  / Slide / Deck (matches the unit toggle behaviour).

Co-Authored-By: Claude Opus 4.7 <[email protected]>

src/help/panel-layers.md

@@ -40,11 +40,14 @@ Each row in the layer list shows:
 - **Drag** rows to reorder. Z-order on the canvas follows the
   list order (top of the list = top of the stack).
 - **Cmd/Ctrl + ]** / **Cmd/Ctrl + [** sends selected layers
-  forward / backward.
-- **Shift+click** to multi-select; then drag a contiguous block.
+  forward / backward. Add **Shift** for bring-to-front / send-to-
+  back.
+- **Shift+click** (or Cmd / Ctrl + click) to multi-select rows.
 - **Group** — select multiple rows + click the Group button (or
-  Cmd/Ctrl + G) to collapse them under a single expandable row.
-  Groups have their own visibility / lock toggles that cascade.
+  press **Cmd/Ctrl + G**) to collapse them under a single
+  expandable row. Groups have their own visibility / lock toggles
+  that cascade.
+- **Ungroup** — click an active group's Ungroup button.
 
 ## Layer options (the per-layer right-side pane)
 
@@ -52,8 +55,9 @@ Clicking a layer in the list (or selecting it on the canvas)
 populates a contextual options block in the right-side floating
 pane. Common controls:
 
-- **Position** — x / y / w / h in inches (or px in screen-DPI
-  modes). Aspect-ratio lock keeps width + height proportional.
+- **Position** — x / y / w / h in canvas units (inches for print
+  modes; pixels for Custom Art / Slide / Deck). The 🔒 button
+  toggles aspect-ratio lock so changing w updates h proportionally.
 - **Rotation** — 0–360°.
 - **Opacity** — 0–1.
 - **Fit** — for image layers: cover / contain / fill / none.

src/help/tool-direct-select.md

@@ -21,8 +21,8 @@ counterpart to Select, which moves the whole layer.
   By default both handles move symmetrically (smooth point).
 - **Alt+drag** a handle to break symmetry — corner point with
   independent handles per side.
-- **Click an anchor without dragging, then Alt+click** to flip
-  between smooth point and corner point.
+- **Alt+click an anchor** toggles between smooth point and corner
+  point.
 
 ## Multi-anchor edits
 
@@ -36,11 +36,13 @@ counterpart to Select, which moves the whole layer.
 
 ## Segment edits
 
-- **Drag a segment** between two anchors to bow it without moving
-  the anchors themselves (curve-direct-edit).
-- **Click an endpoint** when the path is open to continue drawing
-  from it (auto-flips you to the Pen tool with the path's last
-  anchor pre-selected).
+- **Drag a segment** between two anchors to bow it (curve-direct-
+  edit) without moving the anchors themselves.
+- **Alt+click a segment** to insert a new anchor at the click point
+  and drag it.
+- To continue drawing from an open endpoint, switch to the **Pen
+  tool** and click the endpoint — Direct Selection alone won't
+  extend the path.
 
 ## Tips
 

src/help/tool-eyedropper.md

@@ -14,14 +14,19 @@ native `window.EyeDropper` API.
   focus (right-side panel).
 - Press **Esc** to cancel without sampling.
 
-## Inline eyedropper buttons
+## OS colour picker eyedropper
 
-You don't need the toolbar tool to use the eyedropper — many
-colour-input fields in the right-side panels have a small ⊙ button
-next to them that triggers a one-shot sample directly into that
-specific field. Use that when you want to sample a colour for a
-specific property (e.g., stroke colour) without affecting the
-"active" slot.
+The browser's native colour picker (which opens when you click any
+colour field in the right-side panels) also includes its own
+eyedropper button in Chromium-based browsers — useful when you
+want to sample a colour directly into a specific field instead of
+the active slot. Behaviour differs by browser:
+
+- **Chromium-based** (Chrome / Edge / Brave) — the native colour
+  picker has an eyedropper inside.
+- **Safari / Firefox** — no built-in eyedropper. Type a hex value
+  by hand or use the dedicated toolbar tool to sample into the
+  active swatch.
 
 ## Browser support
 

src/help/tool-hand.md

@@ -9,28 +9,24 @@ when the canvas extends beyond the visible area.
 - The cursor changes to a closed grab while dragging.
 - Doesn't select, modify, or create layers.
 
-## Temp-pan from any tool
+## Pen-mode Spacebar reposition
 
-You rarely need to switch to the Hand tool explicitly:
-
-- **Hold Spacebar** with any other tool active to temp-pan. The
-  cursor switches to the grab cursor; release the spacebar to pop
-  back to the previous tool. Works mid-stroke for the Pen + Pencil
-  tools (the in-progress draft stays put).
+A specific case: while mid-draw with the **Pen tool**, holding
+**Spacebar** repositions the anchor you're currently placing (and
+slides its handles with it). This is a Pen-tool-only behaviour, not
+a global "temp-pan". Release to commit the anchor.
 
 ## Zoom controls
 
-Zoom isn't tied to the Hand tool — it works from any tool:
+Zoom isn't tied to the Hand tool — it works from any tool via the
+canvas toolbar at the top of the canvas:
 
-- **Cmd/Ctrl + scroll wheel** zooms toward the cursor.
-- **Cmd/Ctrl + + / -** zoom in / out by one preset step.
-- **Cmd/Ctrl + 0** fits the artboard to the viewport.
-- The **Zoom** select at the top of the canvas chooses a preset
-  level (25% → 400%) or "Fit".
+- **− / +** buttons step by 10 % each.
+- **Zoom dropdown** chooses a preset level.
+- **Fit** button auto-fits the artboard to the viewport.
 
 ## Tips
 
-- The temp-pan modifier is essentially the only reason to flip to
-  the Hand tool deliberately — it gives you a momentary pan without
-  losing your active tool's modal state.
 - A trackpad two-finger swipe also pans without a tool change.
+- For pixel-precise alignment, zoom in via the **+** button until
+  pixel boundaries are visible, then pan with the Hand tool.

src/help/tool-pen.md

@@ -65,11 +65,13 @@ With **multiple anchors selected via the Direct Selection tool**:
 
 ## Tips
 
-- The stroke thickness while drawing matches what's set in the
-  right-side **Stroke** panel — set width + colour before you start
-  if you want immediate visual feedback.
+- The Pen tool's options pane has its own **Fill colour**, **Stroke
+  colour**, and **Stroke width** inputs — set them before you start
+  drawing for immediate visual feedback. They're separate from any
+  layer's existing stroke settings.
+- The **Fill closed path** checkbox in the options pane controls
+  whether a closed path renders with its fill colour or stays
+  outline-only.
 - Pen and Pencil store the same underlying path data, so a Pencil
   sketch can be opened with Direct Selection + edited with the Pen
   ops without conversion.
-- The canvas grid + snap settings (right-side panel) help with
-  precise vector placement.

src/help/tool-pencil.md

@@ -1,45 +1,32 @@
 # Pencil tool (B)
 
-Freehand drawing. Your pointer's path is recorded as a sequence of
-points then smoothed into a Bézier path on release.
+Freehand drawing. Your pointer's path is sampled as a polyline of
+line segments — each stroke becomes its own `shape` (path) layer.
 
 ## Drawing
 
 - **Click + drag** to draw. Release to commit.
-- The resulting layer is a vector `shape` (path kind) — identical
-  data model to a path drawn with the Pen tool, so you can edit it
-  with [Direct Selection](#/help/tool-direct-select) afterwards.
+- The resulting layer is a vector `shape` (path kind) — same
+  underlying data model as a Pen path, so you can edit it with
+  [Direct Selection](#/help/tool-direct-select) afterwards (drag
+  individual anchors, bow segments, etc).
 
-## Smoothing
+## Tool options
 
-The pencil applies a default smoothing pass that:
+The right-side **Tool options** pane has two inputs:
 
-- Drops every Nth point to reduce noise.
-- Fits Bézier handles to the remaining points using a curvature-
-  preserving algorithm.
-- Closes the path automatically if your release point is within a
-  short distance of the start (configurable threshold).
+- **Stroke colour** — the line colour.
+- **Stroke width** — in pixels.
 
-The right-side **Tool options** pane has a smoothing slider — drop
-it to 0 to get every raw input point preserved; crank it up for
-sketch-style smoothed strokes.
-
-## Modifiers
-
-- **Alt+drag** — add to the currently-selected path (extends it
-  from the closest endpoint).
-- **Shift+click** an endpoint of the currently-selected path to
-  continue from that endpoint with a single straight segment.
-
-## Stroke + fill
-
-Like the Pen, the active **Stroke** panel + **Fill** panel apply at
-draw time. A pencil layer with a fill becomes a closed-shape fill;
-with stroke only it stays a single drawn line.
+Both apply at draw time. They're separate from any selected
+layer's stroke settings.
 
 ## Tips
 
-- Trackpad input gives you nicer curves than a mouse — natural
-  micro-jitter feeds the smoother better.
-- For a pixel-perfect path, switch to the **Pen** tool instead —
-  Pencil is for organic strokes, Pen for deliberate Bézier work.
+- Pencil strokes are stored as line-to segments (no smoothing in
+  v1). For a smoothed curve, draw with the **Pen tool** instead and
+  pull tangent handles where you want curves.
+- Each release creates a new layer — for multi-stroke sketches you
+  can group the layers later via the Layers panel.
+- Trackpad input gives you smoother visual motion than a mouse, but
+  the underlying path stays a polyline either way.

src/help/tool-select.md

@@ -6,22 +6,20 @@ The default tool. Moves, scales, and rotates whole layers.
 
 - **Click** a layer to select it. Eight handles appear around the
   bounding box.
-- **Drag** to move. Hold **Shift** to constrain to the nearest 45°
-  axis (horizontal, vertical, or diagonal).
-- **Drag a corner handle** to scale. Hold **Shift** to keep the
-  aspect ratio.
+- **Drag** the layer body to move it.
+- **Drag a corner handle** to scale on both axes.
 - **Drag a side handle** to scale on one axis.
-- **Drag the small rotate handle** above the top edge to rotate. Hold
-  **Shift** to snap to 15° increments.
-- **Hold Alt while dragging** to duplicate the layer in place.
+- **Drag the rotate handle** above the top edge to rotate.
+- **Cmd/Ctrl + D** duplicates the selected layer.
 
 ## Multi-select
 
-- **Shift+click** another layer to add it to the selection.
-- **Cmd/Ctrl+A** selects every layer on the current surface.
+- **Shift+click** (or Cmd / Ctrl + click) another layer to add it to
+  the selection.
 - **Marquee box-select** — click an empty area of the canvas and drag.
   Every layer whose bounding box intersects the marquee joins the
-  selection.
+  selection. Hold **Shift / Cmd / Ctrl** while marqueeing to add to
+  the existing selection instead of replacing it.
 
 With ≥2 layers selected, the **Align & Distribute** panel + the
 **Pathfinder** ops (for vector shapes) become available.
@@ -36,8 +34,6 @@ With ≥2 layers selected, the **Align & Distribute** panel + the
 
 ## Tips
 
-- The Select tool ignores the per-layer visibility / lock state set
-  in the Layers panel. A locked layer still highlights on hover but
-  refuses drag input.
-- Hold **Cmd/Ctrl** while clicking to pick up a layer that's behind
-  another layer at the click point (z-stack walk).
+- A locked layer (lock icon in the Layers panel) refuses drag input
+  on the canvas; the row in the list still highlights on hover.
+- Hidden layers (eye icon off) don't intercept canvas clicks at all.

src/help/tool-shape.md

@@ -1,44 +1,45 @@
 # Shape tool (S)
 
-Drops vector primitives — rectangle, ellipse, polygon, star, line.
-The right-side **Tool options** pane picks the primitive + per-shape
-parameters before you drag.
+Drops vector primitives by drag-creating a bounding box on the
+canvas. The right-side **Tool options** pane picks which primitive +
+its fill / stroke before you drag.
 
 ## Primitives
 
+The options pane's **Shape** dropdown:
+
 - **Rectangle** — drag a bounding box.
-- **Ellipse** — drag a bounding box; the ellipse inscribes it.
-- **Polygon** — N-sided regular polygon. The options pane sets the
-  side count (3 – 32) before you drag.
-- **Star** — M-pointed star. Options pane sets points + inner-radius
-  ratio.
-- **Line** — drag from start to end.
+- **Rounded rectangle** — same but with a configurable corner radius.
+- **Circle** — perfect circle inscribed in the drag bbox.
+- **Ellipse** — ellipse inscribing the drag bbox.
+- **Triangle** — equilateral-ish triangle inscribed in the bbox.
+- **Polygon** — N-sided regular polygon.
+- **Star** — M-pointed star.
+- **Line** — line from drag start to drag end.
 
-## Drag modifiers
+## Tool options
 
-- **Shift** — constrain to a perfect square / circle, snap polygon
-  rotation to 15°, lock line to 45° angles.
-- **Alt** — draw from the centre outward instead of corner-to-corner.
+- **Shape** — the dropdown above.
+- **Fill** checkbox — toggle whether the new shape gets a solid fill.
+- **Fill colour** — picker when Fill is on.
+- **Stroke colour** + **Stroke width** — applies as the new shape's
+  stroke. Setting Stroke width to 0 + Fill on = filled-only.
 
 ## Why these are vector
 
-Every shape is stored as a Bézier path under the hood. Switching to
-**Direct Selection** on any of them auto-converts the primitive into
-an editable anchors-plus-handles path. You can then add / remove /
-modify anchors like any other path.
-
-## Fill + stroke
-
-The right-side **Fill** and **Stroke** panels apply at draw time:
-
-- Solid colour, gradient, or "none".
-- Stroke width, dash pattern, line cap.
-- The active settings render live in the preview while you drag.
+Every primitive stores an internal `shape.kind` plus parameter data
+(point count, inner radius, corner radius, etc). You can tweak those
+parameters later from the layer-options pane. Switching to **Direct
+Selection** on a primitive auto-converts it into an editable
+anchors-plus-handles path, after which the primitive parameters are
+replaced by the raw path data.
 
 ## Tips
 
-- For non-rectangular text containers, draw a shape, then add a text
-  layer on top + use the layer's **Clip** option to clip the text
-  to the shape.
-- The **line** primitive's endpoints are anchors — they show up under
-  Direct Selection and can be moved independently.
+- For non-rectangular text containers: draw a shape, then add a text
+  layer on top + use the text layer's **Clip** option (in the layer-
+  options pane) to clip the text to the shape.
+- The **line** primitive's endpoints are anchors — switching to
+  Direct Selection lets you move each endpoint independently.
+- A drag shorter than ~0.08 in drops a default-sized shape at the
+  cursor (so a click without dragging still creates something).

src/help/tool-text.md

@@ -5,29 +5,28 @@ created with `contentEditable` set so you can type immediately.
 
 ## Creating
 
-- **Drag** a rectangle on the canvas to size the text box.
-- The cursor lands inside the box at the end of the drag — start
-  typing.
-- **Click + release without dragging** drops a default-sized text
-  box at the click point.
+- **Click** the canvas. A default-sized text box drops at the click
+  point, the tool auto-flips back to Select, and the box's
+  contentEditable area gains focus so you can start typing
+  immediately. The placeholder text is pre-selected so your first
+  keystroke replaces it.
 
 ## Editing
 
-A text layer's content is HTML (rich text). Inline marks supported:
+A text layer's content is HTML (rich text). Inline marks are
+applied via the text-layer-options inline buttons (or the browser's
+native rich-text shortcuts when the contenteditable area has focus
+— browser behaviour differs):
 
-- **Bold** (`**bold**` or **Cmd/Ctrl + B**)
-- *Italic* (`*italic*` or **Cmd/Ctrl + I**)
-- Underline (toolbar button or **Cmd/Ctrl + U**)
-- Strikethrough
-- Inline link (paste a URL while text is selected; or use the link
-  button in the **Type** panel).
+- **Bold**, *italic*, underline, strikethrough — via the inline
+  toolbar buttons that appear with a text layer selected.
+- Inline link — use the link button in the layer-options pane to
+  add a URL to selected text.
 
 Block formatting:
 
-- Headings via the right-side type panel.
-- Bulleted / numbered lists (Enter continues the list; empty Enter
-  exits).
-- Alignment (left / center / right / justify).
+- Alignment (left / center / right) via the **Alignment** dropdown.
+- Font, size, colour via the **Type** options pane.
 
 ## Right-side Type panel
 

src/help/vector-tools.md

@@ -42,10 +42,19 @@ whatever you've selected.
 ## Keyboard shortcuts (canvas focus)
 
 - **V / A / H / P / B / S / T / I** — switch tools.
-- **Shift** while drawing — constrain (square / circle / 45° angles).
-- **Alt** — duplicate-as-you-drag for a selected layer.
-- **Arrow keys** — nudge selection by 1 px; **Shift+Arrow** by 10 px.
-- **Cmd/Ctrl + D** — duplicate selected.
 - **Cmd/Ctrl + Z** / **Cmd/Ctrl + Shift + Z** — undo / redo.
-- **Delete / Backspace** — remove selected.
-- **Spacebar** — hold to temp-pan (releases back to the previous tool).
+- **Cmd/Ctrl + Y** — redo (alternate).
+- **Cmd/Ctrl + D** — duplicate selected layer.
+- **Cmd/Ctrl + C / X / V** — copy / cut / paste layer(s).
+- **Cmd/Ctrl + G** — group selected layers.
+- **Cmd/Ctrl + ] / [** — bring forward / send backward; add **Shift**
+  for bring-to-front / send-to-back.
+- **Cmd/Ctrl + J** — close path / join two selected endpoints
+  (Pen / Direct Selection edit mode only).
+- **Cmd/Ctrl + Alt + J** — average selected anchors to their centroid
+  (Pen / Direct Selection edit mode only).
+- **Delete / Backspace** — remove selected layer; remove selected
+  anchor in Pen / Direct Selection edit mode.
+- **Shift + click** (or Cmd / Ctrl + click) — additive multi-select.
+- **Shift while drawing with the Pen tool** — constrain the next
+  anchor to a 45° angle from the previous one.