[KasparsNaglis]

Closes #5000

Important

Needs DataBiosphere/findable-ui#1145 released, then a findable-ui bump in this PR. Until then the type check and build fail in CI. Locally it builds and runs against a linked findable-ui build.

What

Columns

• All 5 tabs: the identity cell tags are their own columns again, and the dataset is its own column. Identity cells keep only the title, clamped to 2 lines.
• Datasets: Access, Identifier and Consent Group columns.
• Donors, BioSamples, Activities: Dataset, plus the former tag fields (organism type, phenotypic sex, reported ethnicity, biosample type, anatomical site, activity type).
• Files: the folder path shows under the file name and wraps between folders. File names wrap at any character. Dataset, File Format and Data Modality (hidden) are columns again.

Sizing

• Value columns hug their values up to a max width, wrap above it, and clamp to 2 lines. The full value shows on hover or focus.
• Each column's max width is the 90th percentile value length in anvil15, kept between 120px and 400px (site-config/anvil-cmg/dev/index/common/columns.ts).

Download menu

• The DRS URI column is gone. The download button opens a menu: "Download file" (open-access files only, with the reason otherwise) and "Copy DRS URI".
• The menu shares its styles with Request Access (app/components/common/DropdownMenu).
• Removed the unused CopyCell and the DRS_URI category key.

Why

The tags under each title took over the first column, and the links got harder to read. The DRS URI column was cut off, so only its copy button was useful.

Notes

• [AnVIL DX] Link identity column dataset subtitles to dataset pages #4984 asks to link the dataset subtitle in identity cells. Datasets are a column now, so that work would move to the Dataset column.
• The e2e sort helper now matches header text exactly. Otherwise "Activity" also matched "Activity Type".

Testing

• Unit tests updated for the identity, column and download menu builders. All 200 pass; lint, tsc and prettier pass.
• AnVIL Playwright suite passes in Chromium (44 tests).
• Checked in the browser with prod data, at 1458px and 1920px.

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