[yordis]

• Clean merge of 3 upstream fixes (read-only preview select-all copy, update command for hand-started servers, faster large recording saves); no fork divergence touched, no conflicts, ledger unchanged.

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Note

Medium Risk
Touches install/update detection, server startup env handling, and recording persistence paths; mistakes could mis-identify installs or lose/corrupt large recordings, but changes are covered by new tests.

Overview
Adds t3-launcher as a first-class server install type so hand-started / symlinked pinned runtimes are detected, advertised to the client, and get a proper t3 update --base-dir … manual update command (UI copy-to-clipboard and docs included). resolveLauncherPath moves to pinnedRuntime, resolves PATH like a shell (skips non-executables), and is used earlier at server boot so InvokedAs survives fixPath.

Large tab recordings (≥8 MiB) stop pulling Base64 chunks over CDP and instead trigger a browser download into a staged file, with integrity checks and tests.

Read-only file preview intercepts copy when Select All spans the virtualized diff view so the full file text lands on the clipboard, with a browser test.

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[github-actions]

This PR changes the test suite by +3 test cases (browser +1, unit 0, server +2).

New browser test files: apps/web/src/components/files/ReadOnlySourcePreview.browser.test.tsx.
Each browser test file costs CI seconds of module loading before its first test runs; a unit test costs milliseconds.

Keep tests that would fail for a real reason, and test logic below the UI where it can be. See Testing.