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fix: animate on SSR first load and survive getBaseTarget removal (#493)

* docs: plan Motion 13.5.0 follow-ups and 13.5.1 alignment

- motion-13.5.0: whilePan base-target helper (getBaseTarget removed
  upstream), unresolved-origin regression coverage, negative bounce
  docs
- motion-13.5.1: dependency refresh and inherit={false} parity,
  blocked until 13.5.1 is on npm

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* docs: document negative bounce (overdamped springs) from Motion 13.5.0

Pin through our public spring export that bounce -0.5 never overshoots
and is monotonic, and leads bounce 0 early at a fixed duration;
bounce 0.5 overshoots as a control. Document the -1..0 range with a
useSpring example (duration is in milliseconds).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* fix: resolve whilePan base targets without VisualElement.getBaseTarget

Motion's main removes VisualElement.getBaseTarget (motion 5114f0074),
which the whilePan restore called at pan start, so the next Motion
release would throw on every pan with whilePan. Add resolveBaseTarget,
mirroring upstream's inline fallback in animateChanges: initial, then
non-MotionValue style, then the value as first read.

Parity tests prove it equals getBaseTarget on Motion 13.5.0 and skip
once the method is gone; value tests keep the behavior pinned.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* test: pin that animated values never render unresolved origins

Port upstream's animate-unresolved-origin regression (Motion 13.5.0,
motion #2791): animating SVG polygon points without a base value must
never write "undefined"/"NaN", and a CSS variable animates from its
inherited value rather than 0. Passes on current code; guided demo
page for manual review.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* docs: record guard PASS for Motion 13.5.0 plans, pending eye test

Co-Authored-By: Claude Opus 5.5... (continued)

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