Improved scheduling workflows, reminder management, and composer consistency

This release focuses on reducing friction in everyday workflows and refining several areas of the new composer experience.

✍️ Composer improvements

• Text style shortcuts restored in templates: Heading and text-style keyboard shortcuts now work correctly inside the template editor, making it faster to create and edit templates without reaching for the mouse.
• Cleaner copy and paste behavior: Fixed an issue where copying and pasting formatted text could introduce an unwanted blank line.
• Escape key behavior restored: Pressing Esc while composing now consistently returns to the familiar draft discard workflow, including the confirmation prompt. This restores the behavior many users relied on prior to the composer upgrade.

⏰ Scheduling and reminder improvements

• Faster time entry: Send Later and Read Later now accept shorthand time formats such as 930 or 1338, which are automatically interpreted as valid times. This makes scheduling messages quicker when working from the keyboard.
• More flexible Read Later management: Based on user feedback, we've restored the original workflow for updating an existing Read Later reminder while adding a dedicated option to remove it entirely. This makes it easier to either adjust a reminder or clear it altogether, consistent with how follow-up reminders work elsewhere in Polymail.

🔗 General improvements

• Fixed help documentation links: Resolved an issue where the "Learn More" link in the Invite People panel could lead to an error page instead of the appropriate help article.

Thank you for your continued feedback. Many of these improvements came directly from issues and suggestions reported by Polymail users.

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