feat: make session creation a sequential workflow

- Refactor CreateSessionForm into step-by-step workflow
- Steps unlock sequentially: Project → Repository → Tool → Clone Mode → Branch
- Add visual step indicators with numbered badges
- Disable controls until prerequisites are met
- Add CSS for workflow step styling

.stoneforge/.dashboard-opened

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+84102
+1779616938758

.stoneforge/.gitignore

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+# Runtime data
+*.db
+*.db-journal
+*.db-wal
+*.db-shm
+daemon-state.json

.stoneforge/config.yaml

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+# Stoneforge Configuration
+
+database: stoneforge.db
+sync:
+  auto_export: true
+  elements_file: elements.jsonl
+  dependencies_file: dependencies.jsonl
+playbooks:
+  paths:
+    - playbooks
+identity:
+  mode: soft
+merge:
+  auto_merge: true
+  target_branch: null
+  require_approval: false
+workflow:
+  preset: auto
+agents:
+  permission_model: unrestricted

.stoneforge/sync/dependencies.jsonl

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+{"blockedId":"el-1of","blockerId":"el-258","type":"parent-child","createdAt":"2026-05-24T09:44:58.759Z","createdBy":"el-2jua"}