[EVWorth]

Problem

A tab bound to a connection that is gone (a closed SQLite file, a disconnected server) runs on the selected connection but stayed bound to the dead one. A BEGIN on a SQLite file from such a tab showed no TX badge on that tab, the last-tab rollback watcher (#941) did not cover it, and the close and switch prompts missed it. The tab also kept the old server's profileId, so it was reconnected to that server at the next start.

Change

• bindUnboundTab in src/stores/resultStore.ts becomes bindTabToRun. It now also rebinds a tab whose connectionId is not live, for both Run and Explain. A tab on another connection that is still live is left alone.
• The rebind is silent, as fix: MySQL failure path ignores QueryError.transaction #942 is for a tab with no connection: the connection the tab leaves is already gone, so there is nothing to roll back and nothing to ask.
• setTabConnection accepts profileId: null to clear the profile. Omitting it still keeps the current one, so existing callers behave as before. The rebind passes the new connection's profile, or null for a SQLite file.
• liveConnectionIds() moves from useConnectionSwitching.ts to src/lib/run-connection.ts, so where a run goes and whether a tab counts as orphaned share one definition.
• Two stale comments fixed (noteTransaction in resultStore.ts, the header of src/lib/transaction-tracking.ts): the backend probes MySQL and MariaDB sessions too, so the statement-reading fallback applies only when the probe got no answer.

No per-tab transaction flag needed clearing on rebind: disconnecting a server or closing a file already forgets the flags of its tabs, and moving the tab makes the session watcher drop anything left.

Not changed

• The rebind keeps tab.database, as fix: MySQL failure path ignores QueryError.transaction #942 does.
• "Runs with no session" from the original report was dropped from fix: SQLite tx untracked from orphaned tabs #944: neither the history panel's "Run now" nor the designer reaches a SQLite file today.

Tests

• resultStore.test.ts: 8 new tests for the orphaned tab (rebound on Run and on Explain, to a server and to a SQLite file; profile replaced or cleared; badge shown; rollback on last tab; close prompt; two guards for a tab on another live connection). One fix: MySQL failure path ignores QueryError.transaction #942 test now makes its second connection live, since it would otherwise be an orphan.
• editorStore.test.ts: omitted profileId keeps the profile, null clears it.
• Seven of these fail with the fix reverse-applied.

Gates run locally: npm run lint (0 errors), npm run type-check, npm run test:unit (204 files, 3814 tests), npx dprint check --list-different, and AppLayout.browser.test.tsx (50 tests), which covers useConnectionSwitching. The rest of the browser suite was not run.

Closes #944

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