🐛 fix(ui): shrink table columns to fit and pin the group Update All button (#467)

[scttbnsn]

Fixes #467 (v1.5.1-rc.4 regression, GA-blocking).

Root cause

The rc.4 v6→v7 preferences migration force-adds the new Version column (~220px) to every existing user's containers column set. The responsive auto-hide budget sums column minimum widths, but the renderer laid columns out at their preferred widths and never shrank them. In the band between those two sums (~1324–1544px of content width for the default column set) the table overflows horizontally, and the group-header Update All button — a plain flex child of a full-row <td colspan>, unlike the sticky right-0 per-row Actions cells — scrolls out of the visible area. Badge and row action icons stay visible, the button silently disappears. Root cause was established by a 5-agent triage workflow and upheld by two independent adversarial verifiers against the rc.3/rc.4 sources.

Fix

• DataTable.resolveColumnWidths() now shrinks columns proportionally toward (never below) minSize when base widths overflow the available width (water-filling with per-pass clamping). Rendered widths now agree with the auto-hide budget's minSize-based "fits" decision, eliminating the divergence band. Expansion behavior for extra > 0 is unchanged and pinned by a hand-verified test.
• The group-header Update All button is pinned to the visible end edge (sticky end-0, logical props for RTL) so it stays reachable even when a table legitimately overflows between auto-hide steps.
• CHANGELOG: [1.5.1-rc.5] section added.

Testing

• New regression spec reproduces the exact rc.4 post-migration column set in the overflow band (available=1300 between minSize-sum 1136 and size-sum 1484) and asserts rendered widths fit with every column ≥ its minSize.
• Floor spec: below the minSize-sum, columns render at exactly minSize and residual overflow is left to auto-hide.
• Expansion-unchanged spec with exact arithmetic; sticky-wrapper spec on the group header.
• Full gate: 3760 ui tests, 100% coverage on all four metrics (app suite also green in pre-push), typecheck, vite build, biome, qlty all clean.

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[biggest-littlest]

Shrink-to-minSize water-filling is the right class fix — render now agrees with the auto-hide budget, and the sticky pin covers the residual overflow band. Regression spec reproduces the reported width band exactly. LGTM.

[ALARGECOMPANY]

Verified the expansion path is pinned unchanged and coverage holds at 100%. CHANGELOG entry reads well. Approving.