### Editing Support (New)
- Add, edit, and delete attribute values directly in the QGIS
attribute table
- Add new columns to Snowflake tables from QGIS (with full Type
dropdown: Text, Integer, Decimal, Boolean, Date, Time, Date & Time)
- Delete columns from Snowflake tables via QGIS
- Add and delete features (rows) with geometry
- Snowflake query errors now surface in the QGIS commit dialog instead
of generic "Could not commit changes" messages

### Stability & Crash Fixes
- Fixed QGIS crash (SIGSEGV) when editing attributes while the map is
rendering
- Fixed QGIS crash when adding a new column and editing values in it
during the same session
- Fixed column headers getting scrambled after adding a new column or
saving edits
- Fixed attribute values appearing as NULL in the UI immediately after
editing (before saving)
- Fixed "float() argument must be a string or a number, not NoneType"
warnings on nullable numeric columns

### H3 Geospatial Index Support
- H3 cell-to-boundary rendering now runs server-side in Snowflake
(faster, no Python h3 dependency required)
- Fixed "Numeric value is not recognized" error when loading H3 layers
with text-type cell IDs
- Both TEXT and NUMBER H3 columns are now correctly detected and
rendered

### SQL & Identifier Handling
- Column names without quotes are now preserved as-is (no forced
lowercasing)
- Simple identifiers (letters, numbers, underscores) are no longer
unnecessarily double-quoted
- Special characters in identifiers are still properly escaped

### Connection & Authentication
- Fixed "Refresh" not updating the table list after schema changes in
Snowflake
- Fixed key-pair authentication failures on connection
- Improved dependency checking at plugin startup

### Export Improvements
- Fixed geometry export failing with "Insert value list does not match
column list" error
- Fixed NULL geometry values causing export failures
- Duplicate primary key values are now detected before export with a
clear warning

### UI & Usability
- Fixed duplicate "Export to Snowflake" entry in the Processing
Toolbox
- Fixed deprecated API warning (QgsRectangle.setMinimal)
- Plugin update notifications now correctly compare against the
published version

None