fix(tui): open sessions by exact ID

[kitlangton]

What

Allow the TUI Open dialog to find a session by its complete session ID, including sessions outside the dialog's initial 50-session fetch.

Before / After

Before: Pasting a valid ses_... ID could show No matches when that session was not already in the local/recent session set. The user could not open it from this dialog.

After: A complete canonical session ID triggers a direct session lookup. An exact returned ID is added to the results and can be opened normally, preserving its location.

How

• packages/tui/src/component/dialog-open.tsx recognizes complete canonical session IDs and resolves them through session.get.
• Session options include the ID as searchable text, so the exact query remains visible after resolution.
• packages/tui/test/cli/tui/dialog-open.test.tsx covers a session absent from the recent list and verifies both navigation and location preservation.

Scope

This keeps existing title/project fuzzy search unchanged. It does not add partial remote ID search.

Testing

• bun run test test/cli/tui/dialog-open.test.tsx
• bun typecheck from packages/tui
• Repository pre-push typecheck across 38 packages
• OpenCode Drive end-to-end run against this branch

Demo

The recording creates a real isolated session, enters its generated session ID in the Open dialog, shows the matching row, and opens it.

recording-38d4cd29-91d9-4dc6-816e-a0cf51a7d6b3.mp4

Flow

flowchart LR
  A[Enter complete session ID] --> B[Direct session.get]
  B --> C{Returned ID is exact match?}
  C -- yes --> D[Add session option]
  C -- no or missing --> E[Show no matches]
  D --> F[Open session and preserve location]

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