feat(ui): add the dot-matrix Glyph primitive and its four chrome bitmaps (RIG-3736)

[rigel-mintaka]

This PR is part of a stack containing 5 PRs:

1. main
2. "feat(ui): add the dot-matrix Glyph primitive and its four chrome bitmaps (RIG-3736)" (this PR)
3. feat(ui): derive the activity-bar avatar initial through one owner (RIG-3737) #1199
4. feat(ui): split ActivityBarItem into its glyph and avatar arms (RIG-3738) #1202
5. feat(ui): convert the chrome pictographs to dot-matrix glyphs (RIG-3739) #1211
6. feat(ui): finish the chrome glyph conversion (RIG-3739) #1219

Adopts the DL-150 / DL-199 technique for UI chrome symbols: an 11x11 1-bit
grid at one CSS px per cell, shape-rendering="crispEdges", one
<rect width="1" height="1"> per lit cell filled on currentColor so the
consuming control's color flows through.

GLYPH_CELLS is keyed on the exhaustive GlyphName union, so a name without
a bitmap is a compile error rather than a silent runtime blank — the guard
BadgeGlyph's GlyphKey already provides. The four canonical grids are
transcribed into design/components.md §Glyphs, which stays the source of
truth for the geometry.

The glyph is decorative: aria-hidden, no role="img" and no aria-label.
It carries no meaning of its own, so a name-bearing label belongs on the
consuming control. This is the deliberate difference from BadgeGlyph, whose
glyph encodes status.

The vcs glyph is one orthogonally-connected shape: cells that touch only
at a corner read as detached specks at 11px under crispEdges, not as a
line, so the branch is fused to the trunk rather than meeting it diagonally.
status and pr are deliberately multi-part (four blocks, two arrows).

No call-site adopts <Glyph/> yet; ActivityBarItem, the render site, and
the chrome audit follow in later commits of this stack.

Ref: RIG-3736, RIG-3603. Design: docs/designs/ui/compass-glyph-primitives/design.md (DL-367).

Co-authored-by: Matt Wilkinson matt@rigel.build

[linear-code]

RIG-3736

RIG-3603

[trunk-io]

😎 This pull request was merged.

[github-actions]

Compass engineering docs preview: https://compass-ux-3736-glyph-primit.compass-eng-docs.pages.dev

Deployed from compass-ux/3736-glyph-primitive at 288e9eb.

Changed pages:

• apps/ui/src/design/components.md

[trunk-io]

This pull request was merged into main as part of stacked PR 1211.