Insert > Icons: an original icon library, a searchable picker and Icon Color (#309) (#318)

Adds wordcraft_render::icon_lib, 61 monochrome icons in ten categories
(Arrows, Communication, Office, People, Nature, Weather, Shapes, Symbols,
Technology, Transport). They are original WordCraft artwork: simple
geometric line drawings designed on a 24x24 grid as path data in code, with
no icon files and nothing copied from another icon set.

insert.icon {"id", "color"?, "size"?} renders the chosen icon with vello_cpu
to a transparent PNG at about 300 ppi and inserts it at the caret through the
ordinary picture path, so it saves to .docx and every other format. Without
an id it lists the library (narrowed by query and category) and asks the
front end for the picker. picture.iconColor repaints a one-colour picture
in a new colour and keeps its transparency.

Insert > Illustrations > Icons opens a dialog with a search box, category
chips and a grid of icons drawn live by the egui painter from the same path
data; Insert or a double click places the selection. Picture Format > Adjust
gains an Icon Color menu. New strings are translated in every catalog.

Catalog parity 393/434 -> 394/434 (90.8%).

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>

docs/roadmap.md

@@ -47,7 +47,7 @@ partial rows are fidelity gaps (beta work), not broken workflows. WordCraft stay
 | M0 | Skeleton and vertical slice (model, layout, render, engine, Word-style UI, CLI, MCP, web) | done | — |
 | M1 | DOCX I/O | done (first version); real-world corpus not started; charts/SmartArt/OLE dropped | 45–75 h |
 | M2 | Home tab | done except Paste Special, Clipboard pane, Style Inspector, Manage Styles, Asian typography (PRs open for four) | 5–10 h |
-| M3 | Insert tab | mostly done; equations done (#191); charts, SmartArt, icons, 3D, screenshot, online media missing | 50–80 h |
+| M3 | Insert tab | mostly done; equations done (#191), icons done (#309); charts, SmartArt, 3D, screenshot, online media missing | 50–80 h |
 | M4 | Layout and Design tabs | done except column balancing, group | 6–10 h |
 | M5 | Tables | done (row splitting, floating tables, style formatting); custom table styles (#256); Draw Table and Eraser (#303) | 6–10 h |
 | M6 | References | first version done (TOC fields, cross-references, Zotero); footnote continuation missing; all 12 bibliography styles (#383) | 15–25 h |
@@ -71,6 +71,7 @@ languages, screen-reader access, ecosystem decisions (VBA, add-ins, cloud), an i
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | trivial | M3: icons landed (#309) |
 | 2026-10-11 | trivial | M11: contour (Tight/Through) wrap done (#354) |
 | 2026-10-11 | trivial | M6: the eight missing bibliography styles landed (#383) |
 | 2026-10-11 | trivial | M7: formatting revisions landed (#41) |