fix: enlarge every sub-2px stroker width to 2px, per Daniel's ruling

Knob track arc, inner-dial needle, and mini velocity-trace all sat below the analytic stroker's opaque-core floor. Raised to 2px; updated visual-design-language.md and core/ui/CLAUDE.md to match; kept the 1px-behavior test, corrected its stale comment.

docs/product/visual-design-language.md

@@ -808,15 +808,15 @@ concession. Everything with a slope or a curve must draw through a primitive tha
 
 | Surface | Where | Disposition |
 |---|---|---|
-| Radial knob track arc | `editor_internal.h` `drawKnobFace` | **Fixed (2026-08-01)** — the stacked-radius `LICE_Arc` ring never reached an opaque core. Now ONE analytic stroke (`strokeArcAA`) at `kKnobTrackArcPx` = 1 px, **below the ≥2 px opaque-core threshold** (`core/ui/CLAUDE.md`) — peak alpha still modulates with the arc's exact pixel-grid alignment (measured ~128–255/255 across the sweep) rather than pinning to 255. An improvement over the old stacked-radius ripple, not full opacity; see `test_stroke_aa.cpp`'s 1 px case for the pinned behaviour. |
+| Radial knob track arc | `editor_internal.h` `drawKnobFace` | **Fixed (2026-08-01), widened (2026-08-01)** — the stacked-radius `LICE_Arc` ring never reached an opaque core. Now ONE analytic stroke (`strokeArcAA`); `kKnobTrackArcPx` was initially left at 1 px, below the ≥2 px opaque-core threshold (`core/ui/CLAUDE.md`), and surfaced to Daniel as a by-eye call — he ruled to enlarge all sub-2 px stroker widths, so it is now 2 px and reaches a guaranteed opaque core. |
 | Radial knob value arc | `editor_internal.h` `drawKnobFace` | **Fixed (2026-08-01)** — same stroke, `kKnobValueArcPx` = 3 px, clear of the opaque-core threshold. Measured: peak **255/255** at every cross-section, weight **2.95–3.11 px** (5% ripple). |
 | Knob needle | `drawKnobFace` | **Fixed (2026-08-01)** — `LICE_ThickFLine`'s minor-axis width thinned it to `cos θ` as the knob swept. Now `strokeLineAA`, 2 px. |
 | Inner curve dial arc | `drawInnerDial` | **Fixed (2026-08-01)** — the arc shared the knob track/value arc's stacked-radius opacity defect. Same one analytic fix, at `kInnerDialArcPx` = 2 px (at the opaque-core threshold). |
-| Inner curve dial needle | `drawInnerDial` | **Converted (2026-08-01), not a defect fix** — this needle was already `LICE_FLine` (float endpoints, always AA), not `LICE_ThickFLine`; a 1 px AA line has no width to lay along a minor axis, so it never had the knob needle's `cos θ` defect. Moved to `strokeLineAA` anyway for one-seam consistency with every other stroke on the editor, not because it was broken. |
+| Inner curve dial needle | `drawInnerDial` | **Converted (2026-08-01), widened (2026-08-01)** — this needle was already `LICE_FLine` (float endpoints, always AA), not `LICE_ThickFLine`; a 1 px AA line has no width to lay along a minor axis, so it never had the knob needle's `cos θ` defect. Moved to `strokeLineAA` at 1 px for one-seam consistency, not because it was broken — but 1 px is below the analytic stroker's opaque-core threshold, so it fell under Daniel's later blanket ruling and is now `kInnerDialNeedlePx` = 2 px. |
 | Staged envelope segment slopes | `editor_paint_waveform.cpp` | **Fixed (2026-08-01)** — one `strokePolylineAA` over the whole polyline, so the stage joints blend once. Vertices stay INTEGER by design: they are the positions the draggable handles are drawn at. |
 | Spline (drawn EG) contour | `editor_paint_waveform.cpp` `paintSplineOverlay` | **Fixed (2026-08-01)** — the trace was never gapped; it was fully aliased (every pixel full or empty) because the loop passed INTEGER `cy`, quantizing the slope into alternating 1/2 px steps. Now sub-pixel y (`subpixelFromPoint`) through `strokePolylineAA`. Measured: peak **255/255**, weight **1.95–2.01 px** (3% ripple). |
 | Velocity-curve popup trace | `editor_paint_curve.cpp` | **Fixed (2026-08-01)** — same cause, same treatment. |
-| Velocity-curve mini thumbnail | `editor_paint_curve.cpp` | **Fixed (2026-08-01)** — stays a 1 px hairline (a 2 px trace blots at thumbnail scale), but strokes analytically at sub-pixel y instead of integer-endpoint `LICE_Line`. |
+| Velocity-curve mini thumbnail | `editor_paint_curve.cpp` | **Fixed (2026-08-01), widened (2026-08-01)** — strokes analytically at sub-pixel y instead of integer-endpoint `LICE_Line`. Initially kept as a 1 px hairline (a 2 px trace was thought to blot at thumbnail scale), but 1 px is below the opaque-core threshold; Daniel's ruling raised `kMiniTracePx` to 2 px, same as the popup trace. |
 | Waveform min/max columns | `draw_kit.cpp` `drawWaveform` | **Fixed** — column fill unchanged (it cannot alias), plus an AA `LICE_FLine` stroke joining each column's extremes to its neighbour's, in the same ink. Shared with the docked bank panel and the browser cards. **Measured cost** (Release, MSVC 14.44, real LICE, 24 stereo cards × 136 columns = 6528 columns): fill alone 0.070 ms per full-grid repaint, fill+stroke 0.48 ms — the stroke is ~0.41 ms, about 2.5% of a 60 Hz frame, and the grid repaints on hover/scroll/drag, not continuously. One-off scratchpad measurement, 2026-08-01, harness not committed — not a standing regression guard; re-measure before relying on it again. |
 | Preview play triangle | `editor_paint_chrome.cpp` | **Fixed** — `LICE_FillTriangle` has no `aa`; its two sloped edges are re-stroked with AA `LICE_FLine`. |
 | Envelope/spline node handles (squares) | `editor_paint_waveform.cpp` | Already clean — axis-aligned `LICE_FillRect`. |