Address late review feedback from PR #84 #85

Address late review feedback from PR #84

Three review findings landed after #84 had already merged. They are valid follow-up work, but none is critical enough to bypass the pull-request workflow's three-round cap.

Work

• Reset a dirty connection appearance draft to Red when its selected custom profile is deleted. The picker already falls back visually, but the draft can currently save the deleted profile ID.
• Replace aria-pressed on connection-selection buttons with selection semantics that screen readers announce correctly.
• Index connections by ID for query-tab rendering instead of scanning the full connection list for every tab.

Source

• PR: Add connection aliases, colours, and wrapping tabs #84 - Add connection aliases, colours, and wrapping tabs
• ConnectionProfilesPanel.tsx
• ConnectionList.tsx
• QueryTabBar.tsx