fix(apollo-react): var picker bug fixes [PLT-98392][PLT-98392]

[SreedharAvvari]

• Removed custom getFullMentionQuery that read forward past the cursor to the next double-space/line break, and reverted to TipTap's built-in mention query (text between @ and cursor)
• The custom logic caused incorrect search queries when @ was inserted mid-text.
  For example - @sre| in schedule an email to @sre| with the following subject would search for sre with the following subject instead of just sre.

Also fixed line gap in tiptap editor
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[github-actions]

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Project	Deployment	Review	Updated (PT)
apollo-canvas	🟢 Ready	Preview, Logs	Feb 27, 2026, 02:10:54 AM
apollo-ui-react	🟢 Ready	Preview, Logs	Feb 27, 2026, 02:09:41 AM
apollo-vertex	🟢 Ready	Preview, Logs	Feb 27, 2026, 02:09:04 AM
apollo-wind	🟢 Ready	Preview, Logs	Feb 27, 2026, 02:08:11 AM

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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[Copilot]

Pull request overview

This PR fixes visual bugs in the variable picker component (resource mention) of the ApChat input editor. The changes simplify the mention query handling logic and correct spacing/alignment issues with resource chips.

Changes:

• Removed custom getFullMentionQuery workaround function and rely on TipTap's built-in mention query handling
• Added line gap spacing (SpacingMicro = 4px) to improve visual appearance of multi-line text in the editor
• Fixed resource chip vertical alignment by adding explicit lineHeight and marginTop properties

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tiptap.utils.ts	Removed getFullMentionQuery function that was a workaround for cursor position issues
tiptap.utils.test.ts	Removed tests for deleted getFullMentionQuery function; tests for textToDocument remain
tiptap-resource-suggestion.tsx	Simplified to use TipTap's built-in props.query and props.range instead of custom query logic
tiptap-editor.styles.ts	Added LINE_GAP constant and incorporated it into row height calculations for better spacing
resource-chip-node-view.tsx	Added lineHeight and marginTop styling to fix chip vertical alignment

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

packages/apollo-react/src/material/components/ap-chat/components/input/tiptap/resource-chip-node-view.tsx:156

• marginTop is using a Padding token (token.Padding.PadXs). In this codebase margins/gaps typically use token.Spacing.* while token.Padding.* is reserved for padding (e.g., chat-disclaimers.tsx:9 uses marginTop: token.Spacing.SpacingXl and padding: token.Padding.PadL). Consider switching this to an equivalent token.Spacing.* value (possibly matching the editor line gap) to keep token semantics consistent.

        height: lineHeight,
        lineHeight,
        verticalAlign: 'top',
        marginTop: token.Padding.PadXs,