fix(lsp): handle window/workDoneProgress/create to prevent server crash

[piakdev]

Summary

• The client advertises window.workDoneProgress: true in its initialize capabilities (via powernap's makeClientCapabilities), which per the LSP spec grants servers permission to send window/workDoneProgress/create requests back to the client.
• No handler was registered for this method. When a server actually sends it (e.g. typescript-language-server during project loading, before initialize even returns), the request goes unanswered and the server treats the failure as fatal — crashing the whole language server process with an unhandled ResponseError.
• Fix: add a no-op HandleWorkDoneProgressCreate handler (same pattern as the existing no-op HandleWorkspaceConfiguration), and register handlers before calling client.Initialize() instead of after — servers may send this request during the initialize handshake itself, so registering afterward is too late for that window.

Repro

1. Configure a typescript LSP server pointing at typescript-language-server --stdio for .js/.ts files.
2. Pin typescript@5.9.3 locally in a workspace (needed separately since typescript@7.x no longer ships tsserver.js — unrelated issue).
3. Run any LSP tool (lsp_symbols, lsp_references, etc.) against a file in that workspace.

Before: server crashes during init with ResponseError: no handler for method: window/workDoneProgress/create, subsequent LSP calls fail with jsonrpc2: connection is closed.

After: server initializes successfully; lsp_symbols/lsp_references return correct results.

Test plan

• Built from this branch, ran lsp_symbols and lsp_references against a real .js file with typescript-language-server configured — both returned correct results instead of crashing.
• go build ./internal/lsp/... compiles clean.

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