fix(rate-ui): keep moving subjects framed by default

[d-sorgcodexagent]

Summary

• add one DRY, shared moving-subject camera initializer in Python and TypeScript
• start PyQt6 Swing/Flight and React Club/Flight at 2x zoom with bounded tracking and Auto Fit enabled
• preserve neutral defaults for static viewports and preserve independent user disable, manual-orbit suspension, snap views, and re-centering
• update the active camera contract and all three durable handoffs in the implementation commit

Continues #4300 under epic #4218 and builds on camera issue #4284.

Exact stack evidence

• current PR head: 98cf35994488dd6f3d66916415bbc9f8e7c8bf3f
• immutable implementation evidence: 01ae99f0f42876c7a6948c30f50e13618da14eca
• exact base: c653f9ff9193d6cdb8e11a13ad0001707e468a42 (fix/rate-mobile-tools-menu, draft PR fix(rate UI): keep toolstrip menus inside constrained viewports #4301)

No existing PR base was changed or retargeted.

Verification

• focused Python/PyQt camera/layout/simulation suite: 49/49
• full React suite: 111 files / 673 tests
• desktop + constrained 2x-DPR Chrome Playwright: 6/6
• TypeScript: pass
• zero-warning ESLint: pass
• production Vite build: pass
• pinned MyPy 1.13 on four changed Python production files: pass
• Ruff check/format and git diff --check: pass
• campaign manifest validator: pass
• campaign and launcher manifest contracts: 14/14
• native Windows inspection: Swing opens at a useful tracked scale and remains in-frame through playback

Contract boundary

This changes camera presentation defaults only. Physics, frames, trajectories, geometry, result schemas, solver outputs, and persistence are unchanged. Tracking and Auto Fit remain independently reversible; manual orbit still suspends tracking and Re-center restores it.

Release boundary

This is draft evidence only. Protected CI, required review, parent integration, UpstreamDrift consumers, remaining #4300 layout work, and ordinary release remain open. Do not close #4300, #4284, or #4218 from this PR alone.

Current-parent reconciliation

Exact head 98cf359 normally preserves the original camera child first and current #4301 head c653f9f second. Independent exact-head review verified a 17-file intended delta, 49 PyQt tests, 673 React tests, six desktop/high-DPI Playwright cases, and all documented static/governance gates. Fresh protected CI and review remain required.

[dieterolson]

Superseded by #4466, which consolidates all 43 open src/rate_of_closure PRs into one
branch. Closing this one is measured, not assumed: verify_coverage.sh reports
safe=43 NOT-covered=0 against consolidated/rate-closure-remainder-2026-08-13, so this
PR's head is contained and nothing here is dropped.

Stacks were folded top-down (each child into its own parent, then the parent upward), so
non-tip work is included rather than skipped — including 8067ca79a (#4171, CAD export
artifact validation) and f9afa9d96 (#4309, strict ground result playback), each of which
lived in exactly one PR and is absent from its stack tip.

The consolidation also repairs defects the merge exposed, listed in #4466: two unguarded
datetime.UTC imports that break the Python 3.10 lane, a PyQt module registry that could no
longer construct the main window, the club-assembly binding and STL/sidecar controls that had
been dropped from the wired tree, and a filelock dependency that would have failed
tests (3.11) at collection.

Reopen this PR if you need its branch; the branch itself is untouched.