Upgrade `@deepnote/blocks` to `3.x.x`

[saltenasl]

We need to upgrade @deepnote/blocks dependency to 3.x.x. It makes the deepnote file format (block schema to be more specific) much more strict. We need to handle the breaking changes gracefully to not break our customer projects.

Breaking Changes in Deepnote File Schema

Category	Breaking Change	TypeScript Impact	Auto-Handled When Parsing	Notes
Type System	DeepnoteBlock now a discriminated union	✅ Yes - requires type narrowing	N/A	Consumer code must use type guards to access variant-specific fields
Type System	Unknown block types rejected	✅ Yes	❌ No	Discriminated union will fail validation for any unrecognized type value
Type System	Cannot mix fields from different block types	✅ Yes	❌ No	Each block must match exactly one schema variant
Required Metadata	BigNumberBlock.metadata.deepnote_big_number_title	✅ Yes - now required string	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	BigNumberBlock.metadata.deepnote_big_number_value	✅ Yes - now required string	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	BigNumberBlock.metadata.deepnote_big_number_format	✅ Yes - now required string	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	All input blocks: metadata.deepnote_variable_name	✅ Yes - now required string	✅ Yes - defaults to 'unnamed_variable'	TS type shows required; parsing provides default
Required Metadata	InputTextBlock.metadata.deepnote_variable_value	✅ Yes - now required string	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	InputTextareaBlock.metadata.deepnote_variable_value	✅ Yes - now required string	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	InputCheckboxBlock.metadata.deepnote_variable_value	✅ Yes - now required boolean	✅ Yes - defaults to false	TS type shows required; parsing provides default
Required Metadata	InputSelectBlock.metadata.deepnote_variable_value	✅ Yes - now required	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	InputSelectBlock.metadata.deepnote_variable_options	✅ Yes - now required array	✅ Yes - defaults to []	TS type shows required; parsing provides default
Required Metadata	InputSelectBlock.metadata.deepnote_variable_custom_options	✅ Yes - now required array	✅ Yes - defaults to []	TS type shows required; parsing provides default
Required Metadata	InputSelectBlock.metadata.deepnote_variable_selected_variable	✅ Yes - now required string	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	InputSelectBlock.metadata.deepnote_variable_select_type	✅ Yes - now required enum	✅ Yes - defaults to 'from-options'	TS type shows required; parsing provides default
Required Metadata	InputSliderBlock.metadata.deepnote_variable_value	✅ Yes - now required string	✅ Yes - defaults to '0'	TS type shows required; parsing provides default
Required Metadata	InputSliderBlock.metadata.deepnote_slider_min_value	✅ Yes - now required number	✅ Yes - defaults to 0	TS type shows required; parsing provides default
Required Metadata	InputSliderBlock.metadata.deepnote_slider_max_value	✅ Yes - now required number	✅ Yes - defaults to 100	TS type shows required; parsing provides default
Required Metadata	InputSliderBlock.metadata.deepnote_slider_step	✅ Yes - now required number	✅ Yes - defaults to 1	TS type shows required; parsing provides default
Required Metadata	InputDateBlock.metadata.deepnote_variable_value	✅ Yes - now required string	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	InputDateRangeBlock.metadata.deepnote_variable_value	✅ Yes - now required	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	InputFileBlock.metadata.deepnote_variable_value	✅ Yes - now required string	✅ Yes - defaults to ''	TS type shows required; parsing provides default
Required Metadata	NotebookFunctionBlock.metadata.function_notebook_id	✅ Yes - now required (nullable)	✅ Yes - defaults to null	TS type shows required; parsing provides default
Required Metadata	Missing metadata object on any block	✅ Yes - metadata now required	✅ Yes - defaults to {}	All block schemas have .default({})
Validation	contentHash must match /^(md5|sha256):[a-f0-9]+$/i	✅ Yes - stricter type	❌ No	Old format hashes will fail validation
Validation	executionStartedAt must be ISO datetime string	✅ Yes - stricter type	❌ No	Non-ISO formats will fail validation
Validation	executionFinishedAt must be ISO datetime string	✅ Yes - stricter type	❌ No	Non-ISO formats will fail validation
Validation	execution.startedAt must be ISO datetime string	✅ Yes - stricter type	❌ No	Non-ISO formats will fail validation
Validation	execution.finishedAt must be ISO datetime string	✅ Yes - stricter type	❌ No	Non-ISO formats will fail validation
Validation	ImageBlock.metadata.deepnote_img_width enum constraint	✅ Yes - limited to specific values	❌ No	Only 'actual', '50%', '75%', '100%' allowed
Validation	ImageBlock.metadata.deepnote_img_alignment enum constraint	✅ Yes - limited to specific values	❌ No	Only 'left', 'center', 'right' allowed
Validation	TextCellCalloutBlock.metadata.color enum constraint	✅ Yes - limited to specific values	❌ No	Only 'blue', 'green', 'yellow', 'red', 'purple' allowed
Validation	SqlBlock.metadata.deepnote_return_variable_type enum constraint	✅ Yes - limited to specific values	❌ No	Only 'dataframe', 'query_preview' allowed
Validation	ButtonBlock.metadata.deepnote_button_color_scheme enum constraint	✅ Yes - limited to specific values	❌ No	Only 'blue', 'red', 'neutral', 'green', 'yellow' allowed
Validation	ButtonBlock.metadata.deepnote_button_behavior enum constraint	✅ Yes - limited to specific values	❌ No	Only 'run', 'set_variable' allowed
Validation	InputSelectBlock.metadata.deepnote_variable_select_type enum constraint	✅ Yes - limited to specific values	✅ Yes - defaults to 'from-options'	Only 'from-options', 'from-variable' allowed
Validation	execution.triggeredBy enum constraint	✅ Yes - limited to specific values	❌ No	Only 'user', 'schedule', 'api', 'ci' allowed
Validation	environment.python.environment enum constraint	✅ Yes - limited to specific values	❌ No	Only 'uv', 'conda', 'venv', 'poetry', 'system' allowed
Content Constraints	ImageBlock.content must be empty	✅ Yes - typed as literal('')	✅ Yes - preprocessed to ''	Non-empty content automatically cleared
Content Constraints	SeparatorBlock.content must be empty	✅ Yes - typed as literal('')	✅ Yes - preprocessed to ''	Non-empty content automatically cleared
Content Constraints	ButtonBlock.content must be empty	✅ Yes - typed as literal('')	✅ Yes - preprocessed to ''	Non-empty content automatically cleared
Content Constraints	VisualizationBlock.content must be empty	✅ Yes - typed as literal('')	✅ Yes - preprocessed to ''	Non-empty content automatically cleared
Content Constraints	NotebookFunctionBlock.content must be empty	✅ Yes - typed as literal('')	✅ Yes - preprocessed to ''	Non-empty content automatically cleared
Field Scope	Execution fields only on executable blocks	✅ Yes - not present in non-executable types	❌ No	executionCount, executionStartedAt, executionFinishedAt, outputs will cause validation failure on non-executable blocks
Public API	Removed BlockMetadata union type export	✅ Yes - no longer exported	N/A	Import from schema instead
Public API	Removed ExecutableBlockMetadata interface export	✅ Yes - no longer exported	N/A	Types now inferred from schema
Public API	Removed individual block metadata type exports	✅ Yes - no longer exported	N/A	Use schema-inferred types instead

Summary by Handling Status

✅ Automatically Handled When Parsing (26 items):

• All required metadata fields with defaults
• Empty content constraints (5 blocks)
• Missing metadata object

❌ Requires Manual Migration (22 items):

• Unknown block types
• Field mixing validation
• contentHash format
• All datetime validations (5 fields)
• All enum constraints (10 fields)
• Execution fields on non-executable blocks

N/A - API Changes (4 items):

• Discriminated union type narrowing requirement
• Removed public type exports