Fix UI freezes with large workspaces

[gschier]

• Batch `model_write` events into a single `model_writes` event per poller drain — importing 3000+ requests no longer freezes the app afterward
• Bulk-delete workspace children with one statement per table, emitting a single workspace delete event; the model store prunes the subtree (documented on `ModelChangeEvent`)
• Run `models_delete` off the main thread
• Only auto-select newly created sidebar items for same-window writes (imports no longer move selection)
• Dev-only: spawn `yaaknode` from the source vendored dir — in-place resource copies invalidate the macOS code signature and the runtime dies with SIGKILL
• Add Import Data to the New Workspace menu

[greptile-apps]

Greptile Summary

The PR batches model-change notifications and moves large deletion work away from the UI thread to prevent freezes in large workspaces. It also makes workspace cascades transactional and adds deferred response-body cleanup.

• Emits drained model changes as batched model_writes events and updates frontend consumers.
• Bulk-deletes workspace children under a savepoint before cleaning response files and blob chunks.
• Adds startup garbage collection for response bodies whose database rows no longer exist.
• Runs model deletion on a blocking worker and limits sidebar auto-selection to same-window writes.
• Adds Import Data to the New Workspace menu and adjusts development plugin runtime paths.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
crates/yaak-models/src/queries/workspaces.rs	Replaces recursive workspace deletion with an atomic bulk cascade and performs external response-body cleanup only after relational deletion succeeds.
crates/yaak-models/src/queries/http_responses.rs	Adds startup garbage collection for blob chunks and response files whose owning response rows no longer exist.
crates-tauri/yaak-app-client/src/models_ext.rs	Batches model notifications, runs deletion on a blocking worker, and schedules startup response-body garbage collection.
apps/yaak-client/components/Sidebar.tsx	Consumes batched model events and only selects newly created sidebar items originating from the current window.
crates/yaak-models/src/client_db.rs	Adds an untracked bulk-delete primitive used where a parent workspace deletion represents the removed subtree.

Sequence Diagram

sequenceDiagram
    participant Caller
    participant DB as SQLite model DB
    participant Blob as Blob DB / response files
    participant UI as Model event consumers
    Caller->>DB: SAVEPOINT delete_workspace
    Caller->>DB: Bulk-delete workspace children
    Caller->>DB: Delete workspace and record parent event
    alt relational deletion succeeds
        Caller->>DB: RELEASE savepoint
        Caller->>Blob: Best-effort response-body cleanup
        DB-->>UI: Batched model_writes event
    else relational deletion fails
        Caller->>DB: ROLLBACK TO and RELEASE savepoint
        DB-->>Caller: Return error without body cleanup
    end
    Note over DB,Blob: Startup GC retries orphaned body cleanup

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