feat(client): sort bundle module trees by size - #2101

Motivation

Fixes #2049.

The Bundle Size module tree shows file and folder sizes, but it does not let users rank siblings by those sizes when investigating large bundles.

Changes

• Add optional Bundled size and Source size descending orders, while retaining the existing order by default and when selecting Original order.
• Sort every level of the tree using the existing file/folder size semantics. Equal sizes retain their original order; zero bundled size does not fall back to source size.
• Preserve node keys, title callbacks and expansion when switching order. Cache size aggregation separately from sorting.
• Add nine unit cases and three browser cases using a real generated report, covering nested folder totals, metric changes, restoring the original order, navigation and filtering.

Validation on Windows with Node 22.23.2:

• Full baseline build and updated client build with type checking passed.
• pnpm --filter @rsdoctor/client run test: 78 passed.
• rs check --type-check: lint, type and format checks passed.
• rs test run module-tree-sort in e2e: 3 passed in Chrome; all three fail on the baseline UI because the sorting control is absent.

The browser fixture normalizes emitted absolute source-map paths to obtain real bundled sizes on Windows. No production source-map behavior is changed.

Screenshots from the same generated report (the metrics files exchange positions when changing the selected size):

Bundled size	Source size