fix(cli): recognize textual motion in sweep checks

[miguel-heygen]

What

hyperframes check now recognizes fixed-geometry text, generated content, CSS counters, and form-control state as real motion instead of failing them with sweep_static. A genuinely frozen composition still fails the guard.

Why

The sweep guard compared box geometry, opacity, variable-font axes, and media pixels across seek samples. A fixed-width countdown could visibly change from 10 to 09 while every recorded field stayed identical, so check concluded that the timeline never advanced. Exact elapsed-time values passed only when their glyph widths happened to alter geometry.

Leading-zero coercion in data-txt remains unchanged because GSAP AttrPlugin owns that behavior. This PR fixes only HyperFrames' liveness proof; authoring guidance or a lint hint for numeric attribute strings remains separate.

How

• Fold direct text, resolved ::before/::after content, and live form values into the existing per-sample fingerprint.
• Include checkbox/radio state, every selected option, and counter state from visible elements, zero-box owners, and composition ancestors.
• Hash length-delimited fields incrementally so raw text does not leave the page and per-sample payloads stay compact.
• Keep the existing sweep_static decision and severity unchanged when all visible-state fingerprints remain equal.

Test plan

• Browser audit suite: 92 tests passed.
• Check pipeline suite: 52 tests passed, including all four frozen-sweep guard controls.
• Regression coverage proves fixed-width text, resolved attr() content, pseudo-content, zero-box counter owners, text inputs, checkboxes, and multi-select state change the fingerprint.
• A frozen countdown with the same channels retains an identical fingerprint.
• Changed-file formatting, oxlint, and diff checks passed.
• CLI typecheck in the reused local dependency environment reached two unrelated baseline/setup errors: studioServer.ts NonSharedBuffer typing and missing ajv/dist/2020.js.
• Documentation updated (not applicable; GSAP attribute-string guidance is separate scope).