Add Find Class and Find Method buttons to the system browser

[claude]

"GemStone: Find Class" and "GemStone: Find Method" are only accessible via the VS Code command palette. The system browser panel has no direct way to invoke either command — users must leave the browser context, open the palette, and type the command name.

Desired behavior: add browser toolbar buttons to invoke these two commands directly. Two options:

• Two separate buttons, one for Find Class and one for Find Method.
• A single "Find…" button that presents a menu to choose between Class and Method.

Related to #34 (UX improvement on Find Class), which covers result sorting — this issue is specifically about the trigger surface.

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Migrated from GitLab: GemStone/grail#41

[ericwinger]

Closing — the System Browser is frozen and not being worked on, so toolbar buttons will not be added to it. #421 already hid the System Browser button on session rows to make the GemStone Explorer the discovered default.

The specific trigger surface asked for here is also going away rather than gaining a button: #479 retires the standalone GemStone: Find Class… picker entirely and points Ctrl+K C at GemStone Search with the Classes scope preselected.

On the underlying need — a way to reach class/method search without going through the command palette — GemStone Search covers it several ways: Ctrl+Shift+A, and a docked panel view that lives on the panel strip next to Terminal and Output, so it is a persistent surface rather than a command you have to remember. #478 also adds a Start Here quick pick with Browse a class and Search your code entries.

If an explicit trigger button on the Explorer view title is still wanted, that is worth its own issue — it is a different surface from the one this issue names, and nothing currently places gemstone.search in a menus contribution.

One correction to the description above: the "Related to #34" reference is a GitLab work-item number carried over by the migration. It resolves to GitHub #240 (now closed), not to GitHub #34.