Switch to first imported token set when importing variables to a different set

[Copilot]

Problem

When importing variables from Figma, if the imported tokens were being added to a token set different from the currently viewed set, users would remain on their current set and wouldn't see the newly imported tokens. This created confusion as users expected to see the tokens they just imported.

For example, if a user was viewing the global token set and imported variables into collection/mode1, they would stay on the global view and not see any of the imported tokens.

Solution

This PR automatically switches the active token set to the first imported token set when the current set is not among the imported sets. This ensures users immediately see the tokens they just imported.

Behavior:

• When clicking "Import All" in the import variables dialog, the system now:
  1. Collects all unique token sets from the imported tokens
  2. Checks if the currently active token set is in the list of imported sets
  3. If not, automatically switches to the first imported token set
  4. If yes, remains on the current set

Example:

// Current active set: "global"
// Importing tokens to: "collection/mode1", "collection/mode2"
// Result: Switches to "collection/mode1"

// Current active set: "global"  
// Importing tokens to: "global", "collection/mode1"
// Result: Stays on "global"

Changes

• Modified ImportedTokensDialog.tsx to add automatic token set switching logic in the handleImportAllClick callback
• Added 2 test cases to verify the switching behavior works correctly
• Created changeset for version tracking

Testing

• ✅ All existing tests pass (11/11 for ImportedTokensDialog)
• ✅ New tests verify switching behavior in both scenarios
• ✅ Linting passes
• ✅ Build succeeds
• ✅ No security vulnerabilities introduced

Fixes the issue where users wouldn't see their imported variables when they were added to a different token set than the currently viewed one.

Original prompt

When importing variables after import and when the set we were importing to is different than the one the user currently viewed, change the viewed set to the first new one that was imported into (could be a new or existing one)

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[changeset-bot]

🦋 Changeset detected

Latest commit: e94275e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@tokens-studio/figma-plugin	Patch

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