feat(quick_search): also allow for the equals operator in note title's quick search

docs/User Guide/User Guide/Basic Concepts and Features/Navigation/Quick search - Exact Match.md

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+# Quick Search - Exact Match Operator
+
+## Overview
+
+Quick Search now supports the exact match operator (`=`) at the beginning of your search query. This allows you to search for notes where the title or content exactly matches your search term, rather than just containing it.
+
+## Usage
+
+To use exact match in Quick Search:
+
+1. Start your search query with the `=` operator
+2. Follow it immediately with your search term (no space after `=`)
+
+### Examples
+
+- `=example` - Finds notes with title exactly "example" or content exactly "example"
+- `=Project Plan` - Finds notes with title exactly "Project Plan" or content exactly "Project Plan"
+- `='hello world'` - Use quotes for multi-word exact matches
+
+### Comparison with Regular Search
+
+| Query | Behavior |
+|-------|----------|
+| `example` | Finds all notes containing "example" anywhere in title or content |
+| `=example` | Finds only notes where the title equals "example" or content equals "example" exactly |
+
+## Technical Details
+
+When you use the `=` operator:
+- The search performs an exact match on note titles
+- For note content, it looks for exact matches of the entire content
+- Partial word matches are excluded
+- The search is case-insensitive
+
+## Limitations
+
+- The `=` operator must be at the very beginning of the search query
+- Spaces after `=` will treat it as a regular search
+- Multiple `=` operators (like `==example`) are treated as regular text search
+
+## Use Cases
+
+This feature is particularly useful when:
+- You know the exact title of a note
+- You want to find notes with specific, complete content
+- You need to distinguish between notes with similar but not identical titles
+- You want to avoid false positives from partial matches
+
+## Related Features
+
+- For more complex exact matching queries, use the full [Search](Search.md) functionality
+- For fuzzy matching (finding results despite typos), use the `~=` operator in the full search
+- For partial matches with wildcards, use operators like `*=*`, `=*`, or `*=` in the full search