Show all changes from branch point on feature branches

[Copilot]

Currently only uncommitted changes are shown. This changes the behavior to show all committed and uncommitted changes from the branch point when on a feature branch, while maintaining the existing behavior (uncommitted only) on the default branch.

Implementation

• Branch detection: Check for main then master to identify default branch
• Feature branches: Use git diff <default>...HEAD to show all changes since branching
• Default branch: Continue using git diff HEAD to show only uncommitted changes
• Untracked files: Included in both cases

Example

On feature branch feature-1:

diff --git a/./feature-file-1.txt b/./feature-file-1.txt  # committed change
+Committed change 1
diff --git a/./uncommitted.txt b/./uncommitted.txt      # uncommitted change
+Uncommitted change

On master branch:

diff --git a/./uncommitted.txt b/./uncommitted.txt      # only uncommitted
+Uncommitted change
# committed changes not shown

Tests Added

• TestServeDiffsText_FeatureBranchShowsAllChanges: Verifies committed + uncommitted changes shown on feature branches
• TestServeDiffsText_MasterBranchShowsOnlyUncommitted: Verifies only uncommitted changes shown on default branch

Original prompt

Current solution shows uncommitted differences. I actually think we need to show all differences both committed and uncommitted from the branch point of the directory. If the directory is on the default branch either master or main typically then we can only show the uncommitted changes.

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