feat: Implement Phase 18 palette image icons and update asset card functionality

docs/architecture/tech_debt_and_optimizations.md

@@ -80,6 +80,7 @@ This document tracks known technical debt, optimization opportunities, and minor
 | 68  | **Use preview cannot predict all prior rules or moving props** — DIRECT can see the current actor and prop plus a limited deterministic queue prefix, but reactive rules and rigid-body motion may change either before a pending Use action runs. | Low | Planned | Phase 17b displays an amber conditional preview when the future pose is uncertain and always recalculates reach during PLAY. One bounded target-movement replan handles ordinary drift without freezing physics. A future predictive timeline may improve authoring accuracy, but must not change persistent prop/spot IDs or claim certainty for simulated rule consequences. See `docs/specs/phase_17b_use_spots.md`. (2026-10-10) |
 | 69  | **Contact entry alone can miss a stickman hitting a fixed prop** — grounded locomotion stops at a shape-sweep safe fraction, sometimes before `body_entered` fires; resting contacts can also chatter after pause or quick separation. | Medium | Implemented; user-verified; automated result undocumented | Phase 17c routes identified blocking-prop sweep hits and actual body contacts through one relative approach-speed scorer and pair gate. Multiple stickman limbs collapse into one rig/prop pair; separation/rearm and cooldown gates suppress repeat hits. The user has verified Phase 17c; no automated behavior verification result is documented. Keep existing collision-rule dispatch independent. See `docs/specs/phase_17c_impact_wobble.md`. (2026-10-14) |
 | 70  | **Impact strength is initially speed based while prop mass is preset based** — material presets set `RigidBody2D.mass`, but fixed props are frozen and mass is not a child-facing setting. | Low | Implemented; future design | Phase 17c keeps the Wobble boolean and visual-only response independent of mass. Impact scoring is centralized in `StageImpactResolver` so a future editable-mass or impulse design can be evaluated without altering the Stage switch or migrating old scene choices. Do not infer a physical impulse from a frozen prop's preset mass; verify any future mass effect separately. See `docs/specs/phase_17c_impact_wobble.md`. (2026-10-14) |
+| 71  | **Palette art is supplied at much higher resolution than its display size** — six 1254 × 1254 PNGs appear in 64 × 64 card image areas. | Low | ✅ Resolved | Phase 18 is implemented and user-verified. The original source PNGs remain 1254 × 1254, Godot imports are capped at 256 px, and `StageChrome` maps the six images by placement ID. The focused palette suite passed; the headless Sandbox Stage loaded, and `git diff --check` passed. Keep the map local to the fixed Stage palette; revisit a data-driven icon descriptor only if tools or themed art become extensible. See `docs/specs/phase_18_palette_icons.md`. (2026-10-14) |
 
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@@ -167,5 +168,6 @@ This document tracks known technical debt, optimization opportunities, and minor
 | 2026-10-13 | Phase 17c Impact wobble architecture specification drafted for final user sign-off (`docs/specs/phase_17c_impact_wobble.md`). A placed prop's saved boolean controls a visual-only wobble in PLAY and a brief EDIT preview. Contact entry plus identified stickman blocking sweeps feed a shared approach-speed gate, including ragdolls and both members of a prop-prop hit. Mass stays independent of the switch, with impact scoring isolated for future mass or impulse work. Scene version advances to 1.4 with older scenes defaulting Off. Logged #69–#70. No implementation code changed. |
 | 2026-10-14 | Phase 17c Impact wobble implementation is present against the approved UI and architecture contracts. The prop card has a per-placement switch and EDIT sample; PLAY routes contacts and identified blocking sweeps through the approach-speed resolver, including ragdoll and prop pairs, while wobbling artwork only. Scene v1.4 stores the setting and migrates older scenes to Off; STOP/reset clears transient motion. Automated behavior verification and in-editor user verification have not been completed. Updated #69–#70; mass-aware scoring remains a future design seam. |
 | 2026-10-14 | User verified Phase 17c Impact wobble. Updated #69 and the Phase 17 plan; no automated behavior verification result was supplied. |
+| 2026-10-14 | Phase 18 palette image icons implemented and user-verified (`docs/specs/phase_18_palette_icons.md`). `StageChrome` maps the six palette placement IDs to preloaded images; the three plural filenames are now singular, original 1254 × 1254 PNGs are preserved, and Godot imports are capped at 256 px for display in the existing 64 × 64 card areas. The focused palette suite passed, the headless Sandbox Stage loaded, and `git diff --check` passed. Godot import exited 0 with Windows certificate-store and global editor-settings warnings. User verified the palette appearance and placement behavior in the Editor; #71 is resolved. |
 
 _End of Log_