fix(types): support nested attribute path strings in relayout, restyle, and update

[CAOShurong]

Overview

In plotly.js runtime, Plotly.relayout, Plotly.restyle, and Plotly.update support updating nested properties using dot/bracket attribute paths (such as 'xaxis.autorange', 'xaxis.range[0]', 'annotations[0].text'), as well as the 2-parameter string invocation form Plotly.relayout(gd, 'xaxis.autorange', true).

With the v4.1 TypeScript definitions, calling relayout() with nested attribute path keys resulted in a type error ('xaxis.autorange' does not exist in type 'Partial<Layout>') because Layout lacked nested attribute path signatures, and only the 2-argument object overload was declared.

Changes

1. tasks/generate_schema_types.mjs & src/types/generated/schema.d.ts:
   • Added common nested axis and title property types directly to Layout (xaxis.autorange, yaxis.autorange, xaxis.range, xaxis.type, xaxis.title, etc.) for IDE autocompletion and hover documentation.
   • Added template literal index signatures [key: ${string}.${string}]: any; and [key: ${string}[${string}]: any; to Layout, allowing any arbitrary dotted or indexed attribute paths while strictly preserving excess-property checks for typos on top-level layout keys (e.g. titl: 'abc' is still caught and rejected as a typo).
2. src/types/core/api.d.ts:
   • Added 2-parameter string attribute path overload for relayout(root, astr, val).
   • Added 2-parameter string attribute path overload for restyle(root, astr, val, traces?).
   • Allowed Partial<Data> | Record<string, any> in restyle and update to support dotted attribute updates on traces.
3. src/types/core/layout.d.ts & lib/index.d.ts:
   • Exported LayoutUpdate = Partial<Layout> type alias.

Verification

• npm run typecheck (tsc --noEmit) passes with 0 errors.
• npm run schema-typegen-diff-check passes with 0 errors (clean sync with generator).
• npm run lint passes with 0 errors.
• Verified that top-level typos (e.g. { titl: 'New Title' }) continue to be caught and rejected by TypeScript with error TS2561 / TS2353.

Fixes #8047.