Shorten prompt descriptions for welcome view

.github/prompts/implement.prompt.md

@@ -1,6 +1,6 @@
 ---
 mode: agent
-description: 'Implement the solution for a problem.'
+description: 'Implement the plan'
 tools: ['edit', 'notebooks', 'search', 'runCommands', 'runTasks', 'usages', 'vscodeAPI', 'problems', 'changes', 'testFailure', 'openSimpleBrowser', 'fetch', 'githubRepo', 'todos', 'runTests']
 ---
 Please write a high quality, general purpose solution. Implement a solution that works correctly for all valid inputs, not just the test cases. Do not hard-code values or create solutions that only work for specific test inputs. Instead, implement the actual logic that solves the problem generally.

.github/prompts/plan.prompt.md

@@ -1,6 +1,6 @@
 ---
 mode: agent
-description: 'Plan the solution for a problem.'
+description: 'Start planning'
 tools: ['getNotebookSummary', 'readNotebookCellOutput', 'search', 'getTerminalOutput', 'terminalSelection', 'terminalLastCommand', 'usages', 'vscodeAPI', 'think', 'problems', 'changes', 'testFailure', 'fetch', 'githubRepo', 'todos', 'get_issue', 'get_issue_comments', 'get_me']
 ---
 Your goal is to prepare a detailed plan to fix the bug or add the new feature, for this you first need to: