fix(importer): include all color attributes in style cache key

[ly-wang19]

Problem

In the newly-added @maic/importer, StyleResolver.buildColorCacheKey builds the color cache key from each node's localName + @val only. But resolveColorUncached reads several OOXML color types from other attributes:

color type	identity attributes read	in cache key?
scrgbClr	@r @g @b	❌
hslClr	@hue @sat @lum	❌
sysClr	@lastClr	❌

So every scrgbClr fill yields the same key regardless of its RGB (likewise every hslClr). The first such color resolved in a RenderContext is cached and then wrongly returned for every later one.

Collision trace

Two shapes on one slide:

• A: <a:solidFill><a:scrgbClr r="100000" g="0" b="0"/></a:solidFill> → red
• B: <a:solidFill><a:scrgbClr r="0" g="0" b="100000"/></a:solidFill> → blue

buildColorCacheKey returns solidFill||scrgbClr: for both → B reuses A's cached red. Live on the import path (lib/import/use-import-pptx.ts → @maic/importer → resolveFill → resolveColor).

Fix

Key each node by the full set of value-bearing attributes the resolver actually reads — val, lastClr, r, g, b, hue, sat, lum — applied to the top-level node and its children/grandchildren (the top-level node can itself be a bare scrgbClr/hslClr/sysClr, e.g. lines 167-190). Behavior-preserving for all previously-distinct keys; only previously-colliding keys become distinct.

With the fix the two fills above key to …|scrgbClr:,,100000,0,0,,, vs …|scrgbClr:,,0,0,100000,,, — distinct, correct colors.

Notes

• No test added: @maic/importer currently ships no test setup, the root vitest config globs only tests/** with no DOM env, and parseXml needs DOMParser — a regression test would require standing up jsdom + a package test harness, out of scope for this fix. The collision trace above is the verification.
• Verified locally: prettier clean, eslint clean, tsc --noEmit error count unchanged (the only errors are pre-existing unresolved-workspace-module noise; StyleResolver.ts type-checks clean).

Closes #702

[wyuc]

The change itself looks good (approving), but this branch currently isn't mergeable and needs a rebase.

The @maic/importer package was renamed to @openmaic/importer on main (the SDK publish in #780), so packages/@maic/importer/src/serializer/StyleResolver.ts no longer exists at that path — GitHub can't create the merge commit against the renamed tree. Could you git rebase origin/main and force-push? The fix should re-home cleanly onto packages/@openmaic/importer/src/serializer/StyleResolver.ts (no content conflict, just the path move). Once it's rebased I'll merge. Thanks!