fix: terminal quoting and the guided troubleshooting dead end

[frankea]

Third round of the local release smoke run (Release build, throwaway bottles), following #245. All three findings are pre-existing and both sit on paths the 3.7.0 changelog touches (the winetricks quoting fix in #242, the troubleshooting fixes in #213).

What was broken

1. Terminal button fails for bottle names with a space. openTerminal built eval "$("<cmd>" shellenv "<name>")" with .esc, which backslash-escapes spaces. Inside double quotes bash keeps the backslash, so WhiskyCmd received QA\ Smoke\ 7\ Copy and printed "A bottle with that name doesn't exist." Reproduced through Terminal.app; WhiskyCmd shellenv "QA Smoke 7 Copy" works when called directly. The command is now assembled with ShellQuoting.commandLine.

2. Guided troubleshooting dead-ends on info nodes. In install-dependencies.json the entry check fails into show_missing_deps, whose only transition is continue. Nothing in the engine or the wizard follows a continue transition and Skip only looks at skipped/default, so the wizard sat on "Missing dependencies found" with Back as the only working control. The same shape exists in five of the eight flows. TroubleshootingFlowEngine.continueStep() follows it, the toolbar shows a Continue button (default action) when the node has one, and Skip falls back to continue.

3. The wizard says "Problem resolved" after giving up. Every flow ends its unresolved branch on an info node tagged phase: export (the same phase as resolved) with fragmentRef: export-escalation, and the wizard renders every export-phase node as the resolved summary. Walked the dependency flow to its end: findings, findings, game-config check, then a green "Problem resolved" for a bottle nothing had been fixed in. A node referencing the escalation fragment now routes through escalate(), which lands on the escalation screen with its export and retry options. Skip and Continue share one transition helper; three engine tests cover Continue, the Skip fallback, and the hand-off.

Verification

• Terminal.app: bottle "QA Smoke 7 Copy", Terminal button, the tab shows the shellenv exports instead of the error.
• Wizard: Install / dependency problems on a program with a dependency-loading diagnosis, Continue on the findings card reaches the Fix step.
• Wizard end state: the same walk now ends on the escalation screen.
• Kit troubleshooting and quoting suites green (21 engine tests incl. the 3 new ones); SwiftFormat 0.58.7 lint and SwiftLint strict clean; en-GB check passes (new key troubleshooting.wizard.continue).

[codecov]

Codecov Report

❌ Patch coverage is 59.37500% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Whisky/Extensions/Bottle+Extensions.swift	0.00%	8 Missing ⚠️
...ws/Troubleshooting/TroubleshootingWizardView.swift	0.00%	3 Missing ⚠️
...it/Troubleshooting/TroubleshootingFlowEngine.swift	90.47%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[frankea]

Reproduced each one on a Release build before the fix and re-checked after a rebuild.

• Terminal: with the bottle "QA Smoke 7 Copy" selected, Terminal.app's tab showed Error: A bottle with that name doesn't exist. before and a clean shellenv after. WhiskyCmd shellenv itself was never at fault.
• Wizard Continue: "Install / dependency problems" on a program with a dependency-loading diagnosis. Before: stuck on "Missing dependencies found" with Skip doing nothing. After: Continue reaches the Fix step, and the second findings card too.
• Escalation: the same walk previously ended on a green "Problem resolved"; with the hand-off routed through escalate() it ends on the escalation screen. Covered by the three new engine tests.

Not in this PR, noted for later: the fix card previews the verb as "unknown" because fix_install_deps carries no verb parameter, and a resolved session still offers "Resume troubleshooting" on the program page.

SwiftFormat 0.58.7 and SwiftLint strict clean, en-GB check passes, engine suite 21/21. Merging.