Add sidebar hide toggles for Spaces and Trends

[jnptzl]

Motivation

• Provide users control to hide the right-hand "Spaces" and "Trends for you" sidebar modules from the popup UI.
• Make hiding reversible and configurable so the extension can toggle these modules without permanently removing DOM nodes.
• Ensure the hide behavior runs on initial load, reacts to dynamic content, and updates when the user changes settings.

Description

• UI: added two toggles in popup.html under the Parameters section for Hide Spaces and Hide Trends, and wired them into the popup state in popup.js by extending DEFAULT_CONFIG with hideSpaces and hideTrends and reflecting their states in updateUI.
• Content script: extended content.js default config with hideSpaces and hideTrends, and added a sidebar filtering subsystem with getSidebar, collectSidebarTargets, and applySidebarFilters that finds the sidebar (e.g. data-testid="sidebarColumn" or aside[aria-label]) and marks matching sections using the reversible CSS class .be-hidden.
• Integration: the content script injects a .be-hidden rule into its stylesheet and runs applySidebarFilters during init(), inside the MutationObserver callback, and when receiving configUpdated messages so changes are applied immediately and for dynamic content.
• Clean behavior: previously hidden elements are unhidden when filters change by removing .be-hidden from elements no longer matching the active filters.

Testing

• Automated tests: none were run.
• Manual validation steps performed during development: confirmed toggles were added to popup.html, DEFAULT_CONFIG and UI reflect the new flags in popup.js, and content.js contains the applySidebarFilters logic and .be-hidden CSS (no automated verification was executed).

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[chatgpt-codex-connector]

Restrict sidebar matches to module headers

The filter logic matches any sidebar text that contains the filter string (e.g., the literal "spaces" from the same function), so enabling “Hide Spaces” will also match unrelated sidebar content that happens to include that word, such as a trending topic like “SpaceX” or “Spaces”, and then hide that item’s closest container. This can unintentionally hide the Trends module or other cards even when hideTrends is off. Consider matching only the module header (specific heading/aria-label) or a stable testid for the Spaces module to avoid false positives.

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